Mitla — Archaeological Site

Location and layout

Mitla is situated at the northeastern end of the Tlacolula Valley (one of Oaxaca’s Central Valleys), approximately 38–44 km southeast of Oaxaca City, on a valley floor at about 1,480 m above sea level. The modern town of San Pablo Villa de Mitla surrounds the archaeological zone, and the name “Mitla” itself derives from the Nahuatl Mictlán due to the site’s association with the underworld and burial, whereas the Zapotec name Lyobaa (“Resting Place”) reflects its funerary importance. The environment is semi-arid, with cacti and agave dotting the landscape; a large cactus fence still demarcates parts of the site, echoing its ancient boundaries. This strategic valley-floor location allowed Mitla to control trade routes and communication toward the Isthmus of Tehuantepec and the Sierra highlands, integrating a network of smaller settlements under its influence.

The site’s core is composed of five distinct groups of monumental architecture, separated by modern buildings and roads. These are conventionally named the Church (Northern) Group, the Columns Group, the Arroyo (Stream) Group, the Adobe (Calvary) Group, and the South Group. The latter two (Adobe and South) are the oldest sections, featuring Classic-period layout: a central plaza surrounded by four platform mounds (constructed of adobe brick and stone) similar in style to Monte Albán’s civic architecture. In contrast, the three later groups (Church, Columns, Arroyo) were built in the Postclassic period and consist of rectangular patios connected by corridors, lined with palaces and temples whose walls are covered in finely carved stone mosaic friezes. Each of these later groups contains anywhere from two to four interconnected courtyards, creating a labyrinthine ceremonial center rather than one grand plaza. Notably, the North/Church Group comprises three adjoining quadrangles (designated A, B, C); the Spanish colonial Church of San Pablo was erected directly atop part of Quadrangle C, physically linking Colonial architecture with pre-Hispanic structures.

The Columns Group similarly contains three patios (D, E, F) on different levels, including the prominent Hall of Columns in Quadrangle D. The Arroyo Group mirrors the layout of the Church and Columns groups and likely dates to the same late period, though it remains partially unexcavated and obscured by later overburden.

Together, these groups covered an urban core of roughly 1–2 km² during Mitla’s height, surrounded by additional residential terraces and agricultural fields. However, modern development overlies parts of the ruins, especially the South Group, of which only scant remains are visible as many structures have been built over or buried. Mitla’s layout thus reflects a combination of earlier Zapotec urban planning—with open plazas and pyramidal mounds—and later innovations of closed, ornate palace complexes. The intimate, enclosed nature of the mosaic-lined courtyards suggests they were used for exclusive rituals and elite residences, in contrast to the large public plaza gatherings at sites like Monte Albán. This urban configuration, with its blend of sacred precincts and living spaces, underscores Mitla’s role as a living religious center integrated with the surrounding community up until the time of European contact. [1] [4] [5]

History and phases

Origins and Zapotec development

The Mitla area has evidence of continuous human occupation from deep antiquity (nearby caves such as Guilá Naquitz contain plant domestication records dating to 8000–5000 BCE), but the first settlement at Mitla itself likely emerged in the Formative period of the Valley of Oaxaca. By at least the Classic period (c. 100–600 CE) a Zapotec village existed at the site, possibly as early as 900 BCE according to some interpretations. This early community occupied a defensible location at the valley’s edge and may have been fortified. During the era when Monte Albán was the dominant Zapotec capital (Classic period), Mitla remained a smaller peripheral center. Nevertheless, cultural exchange is evident: Teotihuacán influence introduced architectural concepts like the talud-tablero or scapulary panel, and Zapotec elites across the valley shared religious practices and writing systems.

Around the end of the Classic period (late 7th–8th century), Monte Albán went into decline. In the ensuing Transitional/Monte Albán V phase (c. 800–1000 CE), power dynamics shifted. Mitla, along with a few other sites, began to rise in prominence as a locus of Zapotec authority. By approximately 750 CE (often cited as the fall of Monte Albán), Mitla was growing into a regional center concentrating political and religious power for the eastern branch of the Central Valleys. Construction of major buildings at Mitla likely accelerated from the Late Classic into the Early Postclassic (roughly 9th–10th centuries). According to modern archaeological interpretations, the most ornate structures at Mitla were initiated around AD 850 and continued to be expanded over the next several centuries.

Postclassic florescence

During the Postclassic period (c. 1000–1521 CE), Mitla reached its apogee as the paramount Zapotec religious center, even as the region saw increasing cultural influence from the Mixtec people. By around 1000 CE, historical accounts indicate Mixtec groups had migrated into or gained political control in parts of the Valley of Oaxaca. Mitla’s art and architecture from this era reflect a syncretism of Zapotec and Mixtec styles – for example, the intensive use of cut-stone mosaic decoration (characteristic of late Zapotec) alongside certain iconographic elements and possibly layout concepts influenced by Mixtec aesthetics. Despite the Mixtec presence, the population remained predominantly Zapotec, and Mitla continued to be central to Zapotec identity and ritual. The city’s population grew to an estimated 10,000 or more inhabitants at its peak (some sources suggest up to ~15,000 including surrounding areas). The urban center at this time covered roughly 1–2 km² with dense noble compounds and temples, and an extended agricultural hinterland of villages and terraced fields (upwards of 20 km² under cultivation) to sustain the populace.

Mitla in the Postclassic functioned as a sacred city, renowned as the “gateway between the world of the living and the world of the dead” in Zapotec belief. The site’s very layout – with tombs integrated under palatial floors – embodied the concept that deceased ancestors (particularly the high priests and kings) became supernatural protectors or “cloud people.” The high priest of the Zapotecs, known as the Uija-tào, is recorded to have resided at Mitla, underscoring the city’s preeminent ritual status. Politically, Mitla also wielded influence, orchestrating alliances or tributary relationships with communities to the east of the Oaxaca Valley and in the Sierra. Archaeological evidence of trade (for instance, coastal shell and highland obsidian artifacts) indicates that Mitla was involved in regional exchange networks, connecting the Central Valleys with the Isthmus of Tehuantepec and beyond.

The Postclassic palaces and temples of Mitla remained in active use right up to the eve of the Spanish invasion. When the Spanish conquistadors and missionaries arrived in the Oaxaca region in the 1520s, they found Mitla still occupied and functioning as the foremost ceremonial center of the Zapotecs.

Spanish conquest and aftermath

Mitla’s encounter with the Spanish was abrupt and destructive. In 1521–1522, Spanish forces under Pedro de Alvarado entered the Oaxaca valleys, and by the mid-1520s Spanish missionaries had reached Mitla. The invaders, recognizing Mitla’s significance to indigenous religion, deliberately sought to break its power. Historical records note that in 1553 the Archbishop of Oaxaca, Francisco de Albuquerque, ordered the demolition of Mitla’s pagan temples. Spanish troops and native conscripts attacked the complex, pulling down walls and defacing the delicate stone mosaics. Only a few of the pre-Hispanic structures were spared complete destruction. In one courtyard (Quadrangle C of the North Group), the Spanish erected a Catholic church (dedicated to St. Paul the Apostle) directly atop the Zapotec foundations, even forcing indigenous laborers to use carved stones from the ancient palaces to build the new temple. This church, whose masonry visibly incorporates cut stones from Mitla’s ruins, symbolized the imposition of the new order over the old. Other architectural elements from Mitla were hauled off to be reused in colonial buildings (for example, some decorative panels from Mitla were said to be installed in the Oaxaca Cathedral’s exterior, as a statement of triumph of Christianity over native religion).

During the early colonial period, Spanish clergy actually occupied some of the ancient rooms of Mitla’s palaces as residences, aiming to repurpose the sacred space and prevent Zapotec rituals from continuing there. Over time, the indigenous population of Mitla was largely converted and subsumed into the new colonial town of San Pablo Villa de Mitla, which grew in and around the ancient site. Unlike many pre-Columbian cities, Mitla was never completely abandoned – its legacy persisted in the living Zapotec community, even as the ruins slowly fell into disrepair. By the 17th century, Mitla’s grandeur was known only through accounts by a few learned friars and travelers: for instance, the Dominican friar Francisco de Burgoa in 1674 wrote a detailed description of its subterranean halls and rich stone mosaics. His writings recorded native legends that one of the tomb complexes led to an expansive underworld realm—a tradition that would capture imaginations centuries later.

Modern era

Mitla entered the awareness of scholars and the broader world in the 19th century as exploration of Mexico’s antiquities began. One of the earliest expeditions was that of Captain Guillermo Dupaix in 1806, who, accompanied by artist Luis Castañeda, documented Mitla’s ruins for the Spanish Crown; their drawings (later published in 1834) illustrated the site’s striking geometric reliefs and cruciform tombs. In the mid-19th century, photographers and researchers such as Désiré Charnay also visited, capturing some of the first images of the “Hall of Columns.” By the late 1800s and early 1900s, professional archaeologists took interest: Eduard Seler and Caecilie Seler studied and sketched Mitla’s painted murals in the 1890s, and Mexico’s Inspector of Monuments, Leopoldo Batres, conducted the first formal excavations and restorations around 1901–1902 (contemporaneous with his work at Monte Albán and Teotihuacan). In 1910, as Mexico celebrated its centennial of Independence, the Porfirian government showcased Mitla as an emblem of the nation’s rich pre-Hispanic heritage, even restoring portions of buildings for the occasion.

Systematic archaeological research intensified in the 20th century. Noted Oaxacan archaeologist Alfonso Caso (famous for excavating Monte Albán) led investigations at Mitla in the 1920s–30s, documenting its architecture and helping to establish a ceramic chronology linking Mitla’s Late Postclassic occupation to earlier phases. In the 1950s–60s, archaeologist Ignacio Marquina and architect Daniel Rubín de la Borbolla undertook conservation work, consolidating some of the freestanding walls and mosaics. Mexican scholars such as Jorge R. Acosta and Eduardo Noguera also contributed to studies of Mitla’s construction techniques and design during this period. In the 1970s, John Paddock and other researchers examined the Mixtec influences in Mitla’s pottery and codices, linking them to wider Postclassic developments in Oaxaca. Recognizing its importance, the Mexican government declared Mitla a federal Zona de Monumentos Arqueológicos (Archaeological Monuments Zone) in 1993, affording it legal protection.

In the early 21st century, efforts to preserve and understand Mitla have accelerated. By 2010, in conjunction with Mexico’s bicentennial celebrations, INAH (National Institute of Anthropology and History) launched conservation projects to mitigate weathering of the carved facades and control urban encroachment. Mitla was also part of a successful nomination to UNESCO’s World Heritage List in 2010 as a component of the “Prehistoric Caves of Yagul and Mitla” site, highlighting the region’s cultural landscape and human history.

Most recently, in 2022–2023, a collaborative project between INAH, UNAM, and the ARX Association (Project Lyobaa) employed advanced geophysical techniques to explore Mitla’s subsurface. The results, announced in 2023, confirmed the existence of extensive underground chambers and tunnels beneath the Church Group—precisely where Zapotec legend and Burgoa’s account placed the entrance to the underworld. These scans also revealed an earlier construction phase below the Palace of the Columns (Columns Group), suggesting that parts of Mitla’s core date to the Late Classic period rather than being purely Postclassic. Such findings are helping scholars rewrite the chronology of Mitla’s development and will guide future excavations and preservation strategies. Mitla today stands not only as a tourist destination but as a living heritage site, with the local Zapotec community actively involved in its stewardship and cultural interpretation. [1] [3] [6] [9]

Architecture and construction

Mitla’s architecture is renowned for its high degree of artistic and engineering refinement, especially evident in the extensive use of stone mosaic fretwork (grecas). The monumental buildings are constructed on elevated platforms of stone and earth, with the superstructures made of stone blocks and adobe mortar, then surfaced with plaster and decorative elements. A distinctive feature of Mitla is the **scapular-shaped paneling** on palace facades: horizontal bands of smooth stone interrupted by inset rectangular recesses and “hanging” stepped fret designs at corners and midpoints. These recessed panels are filled with an array of intricate geometric mosaics. Unlike carved reliefs at other sites, Mitla’s mosaics were assembled from thousands of small, individually cut and polished stones fitted together *without* mortar to create repeating patterns such as grecas (meanders), step-frets, and lattice motifs. In some cases, larger monolithic blocks (like lintels and jambs) were carved in relief with matching designs to integrate with the mosaic; in other instances, the entire pattern was achieved by tightly joining small pieces, essentially creating a stone “tapestry”. The precision of the stone cutting is extraordinary – the corners are sharp and the joins so precise that the mosaics have stood for centuries without collapsing. No other site in Mexico exhibits this kind of elaborate geometric stone decoration on such a scale.

Each of Mitla’s four main palace complexes (Church, Columns, Arroyo, and Adobes Groups) had buildings arranged around patios, and many of these structures had a similar layout: an open rectangular courtyard surrounded by rooms or porticos on at least three sides. The principal building in each group (often on the south or east side of the courtyard) was likely a palace or temple with multiple doorways leading into long halls. The Hall of the Columns in the Columns Group is the most famous example: an expansive rectangular hall (interior ~36.6 m by 6.4 m) whose roof was once supported by six massive monolithic columns of volcanic stone. Each column, carved from a single block, stands over 4 m tall and 1.2 m in diameter, weighing several tons. These pillars not only had a structural function but also an aesthetic one, lending an imposing, orderly rhythm to the hall. The use of free-standing monolithic columns is extremely rare in Mesoamerica (more common in classical Mediterranean architecture, hence early Spanish observers calling Mitla’s buildings “salón de las columnas” and likening them to Greek or Roman constructions). The columns would have supported wooden beams and a flat roof, creating an enclosed space for gatherings of elite or ritual significance.

Mitla’s construction techniques exhibit adaptation to seismic conditions as well. Foundations of major structures were often built by leveling the ground and creating a broad, low platform of stone and adobe – this can be seen in the Adobe Group, where the buildings are literally made of adobe bricks on stone footings. In contrast, the later Groups (Columns, Church, Arroyo) used more stone in their superstructures, likely reflecting improved masonry skills. Walls were composed of a core of rubble and mud mortar sandwiched between cut-stone facings. The lower portions of walls were plain or paneled with smooth slabs, while the upper sections were decorated with the mosaic friezes, perhaps to distribute weight and reduce collapse risk in earthquakes (placing heavier ornamentation higher up on the wall). The rooms often have T-shaped doorways (a form seen in other Mesoamerican sites) and double jambs, possibly to accommodate thick wooden doors or mat screens.

Roofs at Mitla were typically flat and made of wood beams topped by cross-laid sticks, palm thatch or grass, and mud – none of these perishable roofs survive, but beam sockets and column supports indicate their form. Some buildings had corbelled arches (as entranceways to tomb antechambers, for example) with overlapping stones creating a vaulted effect. The tombs themselves, found beneath the floors of certain rooms, are architectural marvels: they are usually cruciform (cross-shaped) in ground plan, with a short entrance passage leading to a larger central chamber and three side chambers (north, east, and west arms of the cross). These tomb chambers were constructed with expertly fitted stone slabs for walls and ceilings. In Tomb 1 and Tomb 2 (located under the Floor of Quadrangle F in the Columns Group), the inner walls are decorated with the same style of mosaic fretwork as the exterior buildings, indicating the reverence and importance of these burial spaces. The capstones of tomb ceilings can span several meters and one in Tomb 2 famously has Zapotec glyphic designs, showing that writing was used in funerary contexts at least minimally.

Originally, Mitla’s gray and pink stone facades were enlivened with color. Traces of red paint and stucco have been found on walls and in the recessed parts of the mosaics. Indeed, archaeologists have noted remnants of a thin white plaster or slip that was applied over a red base coat on the frets. This suggests that in their prime, Mitla’s buildings may have appeared as red and white geometrical masterpieces gleaming in the sun. Additionally, parts of the complex featured elaborate mural paintings. Notably, in the North (Church) Group, fragmentary wall paintings on stone lintels have survived – these are painted in a polychrome, Mixtec-style reminiscent of codices. The extant bits include depictions of stylized figures and patterns, indicating that at least some interiors were richly decorated with pictorial art to complement the abstract exterior mosaics. Large monolithic doorway lintels in the Church and Arroyo Groups show faint remains of these frescoes, which likely depicted mythological scenes or genealogies in the Mixteca-Puebla art style. Unfortunately, most of these murals have deteriorated or were intentionally defaced (some were even whitewashed during the colonial occupation).

In summary, Mitla’s architecture represents a late flowering of Zapotec construction prowess: blending functional design (enclosed palatial quadrangles and load-bearing columns) with meticulous decorative artistry (mosaic friezes and painted glyphs). The planned symmetry of the courtyards, the precise orientation of buildings (most align north–south or east–west), and the integration of tombs under living spaces all reflect a worldview where religious, political, and residential realms were tightly interwoven. Scholars consider Mitla the culmination of Zapotec architecture, and indeed early 20th-century Mexican writers praised it as a work of “titanes” (titans) rather than men. The craftsmanship required to produce its signature grecas – essentially stone mosaic panels each with unique motifs rarely repeated exactly – implies a highly skilled workforce of artisans and a strong centralized authority to marshal such labor for religious devotion. Mitla’s constructions continued up until the Spanish arrival (and, as Spanish records suggest, were still unfinished at that time), marking it as one of the last great achievements of indigenous Mesoamerican architecture before the Conquest. [3] [4] [5] [6]

Sculpture and epigraphy

Mitla’s artistry is embodied more in its architectural decoration than in freestanding sculptures or stelae. Unlike earlier Zapotec centers (e.g., Monte Albán, which has numerous carved stones and inscriptions), Mitla has yielded relatively few carved figurative monuments. Instead, the *buildings themselves* are the canvas for artistic expression. The hallmark mosaic fretwork can be considered a form of **architectural sculpture** – painstakingly crafted patterns symbolizing possibly earth and sky, lightning, feathers, and other cosmological motifs.

Archaeologists have identified at least 14 distinct geometric patterns used in the mosaics, with names such as “greca escalonada” (stepped fret) and “xicalcoliuhqui” (spiral design), and local lore sometimes ascribes meanings to them (for example, some say they represent the motion of stars or the duality of life and death). Each motif is executed with such precision that the visual effect is often compared to textile patterns in stone; indeed, Zapotec weavers to this day incorporate Mitla’s greca designs into their rugs and clothing as a cultural homage.

In terms of movable art, excavations at Mitla have uncovered pottery and small artifacts rather than large sculptures. Fine ceramics from the Postclassic era, often with Mixtec-style polychrome designs (like those known from nearby Zaachila and other sites), have been found in offerings. Some depict deities such as Cocijo (the Zapotec rain god) or feature ornate incense burners. However, Mitla’s most significant “sculptural” artifacts are arguably the monolithic columns and carved beams. The six basalt columns of the Hall of Columns are smooth and lack surface carving, but their sheer scale and form give them a sculptural presence. In the Church Group, one can see an example of a carved stone throne or altar (sometimes called the “Monkeys’ Throne”) which has relief carvings, possibly representing a ruler’s seat – this piece is now mostly eroded.

Epigraphic evidence (writing) at Mitla is scant. The Zapotec had a writing system in earlier times (Monte Albán’s inscriptions), but by the Postclassic, it appears that written records were kept in painted codices rather than carved in stone. Thus, unlike Monte Albán or other Classic sites, Mitla has no lengthy carved inscriptions or date glyphs on its monuments. That said, one of the tomb capstones reportedly features a few carved glyphs or symbols (potentially a calendrical date or name), and some door jambs have abstract symbols that could be glyphic in nature. More prominent is the evidence of pictorial manuscripts and murals: as mentioned, remnants of codex-style paintings on lintels in the North Group strongly suggest that Mitla’s priests and scribes used painted books and murals to convey religious narratives and genealogies. These paintings, though fragmentary, show typical Mixteca-Puebla iconography (such as intertwined figures, day signs, and ornate borders) in bright colors.

An interesting facet of Mitla’s art is the interplay of Zapotec and Mixtec traditions. While the Zapotec script (logosyllabic glyphs) might not be overtly present, Mixtec influence is evident in the storytelling via murals. Additionally, some carved wooden beams (now lost, but mentioned in early accounts) from Mitla’s buildings were said to have painted or carved designs. Friar Burgoa in the 1600s described encountering richly painted wooden beams in Mitla’s underground chambers, possibly with Mixtec-style pictography. If those accounts are accurate, it means Mitla’s sacred precinct housed precious ritual texts or symbols that the Spanish likely destroyed.
In summary, Mitla’s “sculpture” is inseparable from its architecture: the entire site is a sculptural marvel of patterned stone. The absence of carved stone monuments with texts is compensated by the pervasive symbolic motifs in the mosaic panels. These geometric reliefs can be considered a form of symbolic communication—perhaps a visual language of cosmology and status. The tomb decorations, for instance, likely signified the noble lineage or religious significance of those interred, using patterns and placement in lieu of written epitaphs. While we have limited direct epigraphic data from Mitla, ongoing investigations (and technologies like UV imaging on the faded murals) may yet reveal more of the stories once recorded on its walls, offering a glimpse into the beliefs and rituals of the Zapotecs at the end of pre-Hispanic times. [3] [4] [5] [7]

Archaeological research

The ruins of Mitla have attracted attention for centuries, beginning with Spanish chroniclers who documented indigenous stories and the site’s appearance. One of the earliest accounts comes from the 16th-century Franciscan friar **Toribio de Motolinía**, who wrote that Mitla’s buildings were “more worthy of being seen than any others in New Spain” – a testament to their grandeur even shortly after the conquest. In 1674, Dominican friar **Francisco de Burgoa** gave the first extensive description, recording the layout of subterranean chambers and relating the local belief that these were entrances to an underworld palace of the Zapotec lords. Burgoa’s narrative of vast pillared caverns beneath Mitla fired the imagination of later explorers.

In the early 19th century, scientific exploration began. Guillermo Dupaix’s Royal Antiquities Expedition reached Mitla in 1806, conducting some of the first drawings and mappings of the standing structures. Dupaix was struck by the precision of the stone mosaics and correctly identified one tomb with a cruciform plan, though some details of his report were inaccurate by modern standards. His sketches, published in Antiquités Mexicaines (Paris, 1834), introduced Mitla to the Old World scholarly community. In the mid-1800s, French photographer Désiré Charnay and others captured early photographs, while travelers like Bayard Taylor wrote popular descriptions, spreading Mitla’s fame as the “mosaic halls of the ancient Zapotecs.”

Formal archaeology took off around the turn of the 20th century. Eduard Seler, the German ethnographer, visited in 1895–1897 and documented painted murals and architectural details, producing meticulous drawings (his wife Caecilie Seler’s watercolors of the Mitla murals remain valuable records). Mexican archaeologist Leopoldo Batres undertook excavations in 1901–1902, clearing debris, excavating Tomb 1 and Tomb 2, and controversially reconstructing parts of the palace walls with new mortar (a practice common in his era). Some of Batres’ restorations have since been corrected, but he did uncover and catalog various artifacts, and his work established the first on-site museum exhibits.

Throughout the 20th century, research often focused on conservation and documentation. Alfonso Caso and Ignacio Bernal studied Mitla as part of broader projects on Oaxacan archaeology; Caso in the 1930s hypothesized about the site’s relationship to Monte Albán and published on Mixtec-Zapotec interactions. The 1950s–60s saw investigations by Pedro Armillas and John Paddock, who analyzed Mitla’s ceramics and related them to a Postclassic chronology (Paddock’s Ancient Oaxaca (1966) synthesizes some of this). In the 1970s, architect Wanda Tommasi and archaeologist Silvia Garza included Mitla in the Cultural Atlas of Mexico: Archaeology project, highlighting its unique architecture. Mexican archaeologist Nelly M. Robles García has been a key figure in late-20th and early-21st century research: she oversaw site management for INAH, wrote extensively on Mitla’s cultural development, and spearheaded conservation initiatives. Under her guidance, Mitla’s nomination for UNESCO World Heritage was prepared, emphasizing the site’s outstanding universal value as the apex of Zapotec architecture and a place where indigenous tradition remains alive (the local Zapotec language and customs persist).

Conservation has been a major theme in Mitla’s recent history. In the 1970s, INAH installed protective measures (like a perimeter fence and signage) to shield the core ruins from modern encroachment. The delicate stone mosaics have required monitoring and periodic restoration; environmental factors, including earthquakes (Oaxaca is a seismic region) and biological growth, pose ongoing risks. In 2009–2010, funding was boosted (partly in anticipation of the bicentennial and the UNESCO bid) to clean graffiti, repair rainwater damage, and re-erect fallen stones. The World Monuments Fund also listed Mitla as a site of concern, contributing to documentation and site management planning.

One of the most exciting developments has been the application of modern technology to explore beneath Mitla. The ARX Project’s “Project Lyobaa” (2022) used Ground Penetrating Radar (GPR), electrical resistivity tomography, and seismic tomography to scan under the Church Group and Columns Group. In a 2023 press conference, researchers confirmed they found large voids directly under the church’s main altar, aligned northwest, as well as what appears to be a network of tunnels and chambers matching Burgoa’s description of the underworld labyrinth. They even identified what could be a sealed entrance beneath the altar floor. Additionally, beneath the Palace of the Columns, evidence emerged of an underlying structure – possibly an earlier phase of the building dating to the Classic period, implying that Mitla’s occupation as a ceremonial center started earlier than the purely Postclassic constructions visible today. These discoveries have not yet been physically excavated (due to the need to protect the standing monuments and the active church), but plans are underway for further non-invasive study and careful archaeological probing in consultation with the church authorities and the local community.

Going forward, archaeological research at Mitla balances between uncovering the past and conserving the present. The living town of Mitla, with its continual habitation, means archaeologists must work closely with residents when considering any excavations (many portions of the ancient city lie under streets, houses, and fields). Fortunately, the community takes pride in the ruins – local guides often come from Zapotec families who have been in the area for generations, and recent initiatives involve them in preservation efforts. Scholars continue to study Mitla’s place in the wider Mesoamerican context: for instance, comparisons of Mitla’s motifs with those in Mixteca Alta sites and Central Mexican codices, chemical sourcing of Mitla’s obsidian to map trade, and 3D photogrammetric recording of the site’s current state for virtual reconstruction. Each new finding, from the faint pigmentation on a stone frieze to the echo of an empty tomb chamber, adds a piece to the puzzle of how Mitla functioned as a bridge between worlds – the temporal and the eternal, the indigenous past and the colonial present. As one researcher aptly noted, “Mitla is where the stones speak,” and through ongoing research, we are learning to listen. [1] [4] [5] [7] [8] [9]

Key features

Church Group / Grupo del Norte

Also called the North Group, this complex comprises three adjoining rectangular courtyards (labeled A, B, C) aligned north–south. Courtyard C contains the 16th-century San Pablo Church built directly atop a pre-Hispanic platform, with its atrium utilizing the ancient stones. The remaining Zapotec halls in this group feature extensive mosaic friezes and red-toned wall paintings on some interior lintels (one of the few places where Mitla’s original codex-style murals are visible). In colonial times, portions of the North Group were repurposed – Courtyard A served as a stable and trash dump, and Courtyard B as a residence (curato) for clergy, which fortunately led to the preservation of some pre-Hispanic rooms. Today visitors can see doorways with carved cross motifs (added by Spaniards) juxtaposed against Zapotec mosaic panels.

Columns Group / Grupo de las Columnas

The most celebrated ensemble at Mitla, the Columns Group consists of three quadrangles (D, E, F) on slightly different levels. Its main courtyard (Quadrangle D) is often called the “Palace of the Columns” – a long building with five doorways leading into the grand Hall of Columns. Six monolithic stone columns line the center of this hall, which once supported a wide wooden roof, possibly for an audience or throne room. The south facade of Quadrangle D is adorned with some of the finest mosaic fretwork in Mesoamerica, including panels of step-frets and greca meanders in perfectly cut stone. Adjoining this is Quadrangle E, an open patio with platform mounds on each side (thought to have been lesser residences or administrative buildings). Quadrangle F, at a lower level, contains Room 21 – noted for its especially fine mosaic friezes – and the entrances to **Tomb 1 and Tomb 2**, hidden in a small patio often called the Patio of the Tombs. These two tombs, beneath the floor of a room, are cruciform in plan and lined with stone mosaic panels, mirroring the palace above. Important persons (likely high priests or lords) were interred here with offerings. The Columns Group’s integration of elite residence, assembly hall, and richly decorated tombs epitomizes Mitla’s role as both a place of governance and a sacred necropolis.

Arroyo Group / Grupo del Arroyo

Located to the west of the Church Group, the Arroyo (Stream) Group is a set of structures similar in design to the Church and Columns groups, likely built in the same Postclassic period. It is named for a small seasonal brook nearby. The group comprises at least two patios surrounded by halls, but a portion of it remains covered by later fill and has not been fully excavated. Visible elements include staircases, wall bases, and a few lintel stones with decoration. It’s believed the Arroyo Group may have served a residential or administrative function for lesser nobility or priests, and possibly connected via pathways to the Columns Group. Some of its surviving walls show traces of red paint and geometric motifs. Continued archaeological work could reveal more of this complex, but for now it offers a tantalizing glimpse of Mitla’s unfinished excavation areas.

Adobe (Calvary) Group / Grupo de los Adobes (Calvario)

This group is an earlier construction, pre-dating the elaborate mosaic style. It centers on a roughly square plaza bordered by four low platform mounds. Unlike the stone masonry of the later palaces, these structures were built largely of adobe bricks (sun-dried mud blocks), giving the group its name. The eastern mound is the largest, likely supporting a temple or elite residence; notably, a small colonial-era chapel (Calvario) was built atop it, indicating the continued sacredness of the spot into Spanish times. The other three mounds are smaller and probably held auxiliary buildings or altars. The spatial arrangement – a central open plaza – and construction method of this group resemble the Classic-period sites (like Monte Albán), suggesting the Adobe Group could date to Monte Albán’s later phases or the Transition period (c. 700–900 CE). Today, only scant remains of adobe walls and foundations are visible, as adobe is perishable and many bricks have eroded or been scavenged. Still, this group provides critical evidence of Mitla’s architectural evolution and shows that before the flamboyant stone mosaics, a more traditional form of Mesoamerican civic architecture stood on this spot.

South Group / Grupo del Sur

Believed to be the oldest section of Mitla, the South Group lies a short distance south of the other complexes and is largely covered by the modern town’s buildings and streets. Like the Adobe Group, it had a Classic-style layout: a quadrangular plaza with four surrounding mounds (the eastern mound being the tallest). Excavations here have been limited, as much of the area has been built over, but early 20th-century surveys recorded remains of stone foundations and pottery indicating a long occupation. The South Group’s remnants suggest it may date to the end of the Monte Albán era (perhaps 600–800 CE), making it contemporary with or slightly earlier than the Adobe Group. Unfortunately, urban encroachment means only bits and pieces are visible today – a portion of a platform or some scattered cut stones. Efforts are ongoing to acquire and protect more of this area. The significance of the South Group is that it potentially marks the initial footprint of Mitla as a ceremonial center before the site expanded northward. Even in its obscured state, it reminds us that Mitla’s full extent is not yet completely revealed, and important early chapters of its history might still lie hidden beneath the modern town. [3] [4]

Visiting notes

Mitla is open to visitors daily, 8 AM to 5 PM (last entry at 4:30 PM). Admission is around MXN $100 (with free entrance on Sundays for Mexican citizens and residents). The site is easily reached by car or bus from Oaxaca City – take Highway 190 (Pan-American Highway) southeast for about 40 km (a 45–60 minute drive) and follow signs to San Pablo Villa de Mitla; the archaeological zone is just north of the town center. Parking is available near the entrance, and an information center/ticket office provides maps and brochures (mostly in Spanish, with some English available). It is recommended to hire a local guide at the gate for a more informative experience; many are bilingual and can explain the history and meaning of the mosaic patterns.

Inside the site, paths lead through the main groups. The ground is flat but often uneven with stone steps and gravel, so comfortable walking shoes and sun protection are advised (the valley sun can be intense). Unlike expansive sites such as Monte Albán, Mitla’s ruins are compact and partially interwoven with the town – one minute you’re in a thousand-year-old courtyard, the next you see a modern home over a fence. Respect all roped-off areas: many walls and mosaics are fragile, and some structures (especially the Columns Group halls and tomb entrances) are accessible only via designated steps. Do not climb on the decorated walls or attempt to enter closed tombs, to help preserve the plaster and stonework. Photography is allowed (no flash in areas with paint traces, to protect the pigment).

A small on-site museum (or display room) near the entrance showcases a few artifacts from Mitla, such as pottery, stone tools, and reproductions of the tomb glyphs. Also, adjacent to the ruins is the historic Church of San Pablo, which visitors can view from the outside; it remains an active parish church, so entry is limited during services. From the site, one can appreciate the juxtaposition of Spanish colonial architecture atop Zapotec foundations. For a broader perspective, you might walk up the hill behind the town (towards the prehistoric caves area) for a panoramic view of Mitla’s layout within the valley.

Facilities include clean restrooms, a few shaded benches, and a row of souvenir stalls at the exit where local Zapotec artisans sell woven textiles, mezcal, and replicas of the Mitla fretwork (purchasing these helps support the community). There are several restaurants and small eateries in town, offering traditional Oaxacan dishes – a good plan is to arrive in the morning, tour the ruins (1–2 hours), then enjoy lunch in Mitla town. As always, carry water and wear a hat. Mitla is generally safe and warmly welcomes tourists; the blending of living town and ancient site offers a unique experience where one can witness how the legacy of the “Place of the Dead” continues to be part of the life of the modern community. [4]

References

1. Robles García, Nelly M. (2016). Mitla: Su desarrollo cultural e importancia regional. México, D.F.: Fondo de Cultura Económica / El Colegio de México / Fideicomiso Historia de las Américas. Comprehensive academic study of Mitla’s cultural development, chronology, and archaeology.
2. UNESCO World Heritage Centre. (2010). “Prehistoric Caves of Yagul and Mitla in the Central Valley of Oaxaca.” https://whc.unesco.org/en/list/1352/. Inscription summary and significance of the site’s cultural landscape.
3. Arqueología Mexicana. (2007). “Mitla, Oaxaca.” Recorridos por Oaxaca – Valles Centrales: guía visual, Especial 24, pp. 62–69. Descriptive overview with photos, covering Mitla’s history, architecture, and site groups.
4. INAH – Lugares. “Mitla.” https://lugares.inah.gob.mx/en/node/4350. Official site information by Mexico’s National Institute of Anthropology and History (history, visitor info).
5. ARX Project & INAH (2023). “Project Lyobaa – Results from the first 2022 Season.” https://www.arxproject.org/projectlyobaa2022. Press release detailing geophysical discoveries of underground chambers at Mitla.
6. Garza, Silvia, and Wanda Tommasi. (1987). Atlas Cultural de México: Arqueología. Mexico City: SEP/INAH – Grupo Editorial Planeta. (See pp. 75–76). Cultural atlas entry summarizing Mitla’s significance and features in context.
7. Seler, Eduard. (1906). Les ruines de Mitla. Paris: 10^e Congrès International des Américanistes. Early detailed study of Mitla’s ruins and murals by a pioneering Mesoamericanist.
8. Caso, Alfonso, and Ignacio Bernal. (1952). “Mitla” in El Tesoro de Monte Albán. Mexico: Fondo de Cultura Económica. Background on Zapotec-Mixtec interactions and Mitla’s relation to Monte Albán.
9. Anderson, Sonja. (2023). “Archaeologists Discover Entrance to the Zapotec Underworld Beneath a Church in Mexico.” Smithsonian Magazine, July 18, 2023. Report on recent geophysical research confirming Mitla’s subterranean chambers.