Teotihuacan · Mexico · 19.6925, -98.843889 · PYR record in the living atlas
Teotihuacan was one of the largest cities on Earth in its day, laid out on a grid around a three-kilometre avenue, with a pyramid whose base is among the biggest ever built. It is also anonymous. No ruler has been named, no royal tomb identified, no king list recovered. Its murals are crowded with figures and almost none of them carry a name glyph, which is startling given that Maya cities a thousand kilometres away were carving their kings' names, parents and accession dates into stone at the same moment. We do not know what the people who built it called it, or what they called themselves.
Everything you call it was named by strangers
Teotihuacan is Nahuatl. The Aztecs gave the ruins that name centuries after the city was abandoned, and it is usually translated as something like the place where the gods were born. The Avenue of the Dead is Aztec too: they took the mounds flanking it for tombs, which they are not. Even the Pyramid of the Sun and the Pyramid of the Moon are Aztec labels applied to buildings whose dedications are unknown. Every proper noun on the site map is a guess made by visitors who arrived seven centuries late.
The city, counted properly
The headline population figure has quietly moved. René Millon's Teotihuacan Mapping Project of the 1960s and 1970s produced the map everything else rests on, over 2,000 structures and roughly 2,300 apartment compounds across some 20 square kilometres, and Millon offered a range from 75,000 to over 200,000 with 125,000 as the probable figure. In 2019 Michael Smith and colleagues went back to that map and did the arithmetic differently: rather than assume a typical compound size, they measured the compounds, used network analysis on 17 excavated examples to identify the individual dwellings inside them, and extrapolated from measured floor area using household sizes drawn from later Mesoamerican census records. Their best estimate for the city's peak is 100,000. That is still an enormous ancient city. It is also 25,000 fewer than the number most guidebooks print, and the difference is entirely about method rather than about new digging. The older maximalist figure of 200,000 comes out of readings of the same Millon map and is not where current work sits.
One caveat belongs with every sentence in this article and with every other article about the place. Only about three per cent of the site has been archaeologically excavated, chiefly for want of funding. Almost everything anyone says about Teotihuacan rests on a very small sample of it.
What is not in question is how those people lived. Most Teotihuacanos occupied walled multi-family compounds, many with plastered and painted walls, a standard of urban housing with few parallels anywhere in antiquity. The city's signature architectural form, the talud-tablero, a sloping apron carrying a framed vertical panel above it, travelled with its influence and turns up at Mesoamerican centres well outside the valley. Whole districts housed people from Oaxaca and from the Maya lowlands, keeping their own pottery and burial customs inside a foreign capital, and bioarchaeological DNA work published in the early 2020s confirms from the skeletons what the pottery implied: the population was genetically mixed.
The pyramid you photograph is partly Leopoldo Batres
Here is a figure the popular accounts get wrong by omission. The Pyramid of the Sun measures roughly 220 by 230 metres at the base and stands somewhere between 63 and 66 metres depending on which published measurement you take, but its present silhouette is not entirely ancient. Between 1905 and 1910, restoring the monument in a hurry for Mexico's centenary celebrations, Leopoldo Batres stripped a great deal of the original facing stone and added a fifth terrace that the building did not have. The profile in your photograph is in part an Edwardian reconstruction, the original summit is lost, and the exact original dimensions are therefore debated rather than known. When you read that the pyramid encodes some proportion, ask which surface is being measured.
Under the Feathered Serpent, a tunnel nobody expected
In autumn 2003 heavy rain opened a sinkhole at the foot of the Temple of the Feathered Serpent. Sergio Gómez Chávez climbed down and found a sealed passage. Ground-penetrating radar in 2004 and 2005 traced it about 100 metres from the Ciudadela to a point beneath the temple, with its entrance blocked by boulders roughly 1,800 years ago. AMS radiocarbon on materials from the tunnel gives roughly 125 to 240 AD, and the pyramid above it is dated to about 180 to 230 AD (Gómez Chávez and colleagues, Radiocarbon, 2016). Excavation began in 2009 and took years.
The published count has moved as the work went on, which is worth stating rather than quietly correcting. Reports in the mid-2010s gave something on the order of 75,000 objects; after sixteen years of excavation the total is now reported at more than 300,000 ceremonial artefacts: shell, obsidian blades, jaguar bone, amber, beetle wings, jade, and necklaces recovered with their original cord intact. The walls carry pyrite dust that glitters like stars under a moving light, the floor holds traces of liquid mercury, and at the end are chambers with finely carved stone figures. What is not there is a king. No royal burial has been identified, and Gómez reads the tunnel as a modelled underworld, a resting place for founders and gods rather than a labelled grave.
The pyramid above the tunnel went up in a single building episode, and its dedication was not symbolic. Work by Rubén Cabrera Castro, Saburo Sugiyama and George Cowgill recovered the remains of roughly 200 sacrificed individuals from it, most of them male and equipped as warriors, placed in the fabric of the building.
That leaves the central question exactly where it was. Teotihuacan scholarship has a genuine fault line running through it, between those who expect an all-powerful ruler whose tomb has simply not been found yet, and those who follow Linda Manzanilla in reading the city as governed by a council of elite houses that never produced a portrait king in the first place. Neither side has closed the argument. It is one of the largest unanswered questions in the archaeology of the Americas, and it is worth saying plainly that it is unanswered.
Other people wrote its history down
The city that names nobody is named repeatedly by its neighbours. Tikal Stela 31 and monuments at Uaxactun and El Perú record the arrival at Tikal, in January of 378, of a figure called Sihyaj K'ahk'. The Maya ruler Chak Tok Ich'aak I died on the same day. Sihyaj K'ahk' acts under the authority of a personage called Spearthrower Owl, whom David Stuart proposed was the ruler of Teotihuacan itself. Scholars have argued for decades over whether this was conquest, a coup with foreign backing, or Maya lords borrowing foreign prestige; by 2003 even George Cowgill, long cautious about Teotihuacan's reach, accepted that it had probably exercised some kind of political control in the Maya area.
The ground has since caught up with the texts. LiDAR flown over Tikal in 2016 showed that a wooded hillock beside two elite residential groups was not a hillock. Excavation from 2019 to 2021, published in Antiquity, found a walled complex reproducing the layout of Teotihuacan's Ciudadela at about 30 per cent smaller scale, laid out on 15.5 degrees east of north to match the Teotihuacan grid rather than Tikal's, built with clay and adobe in a way local builders did not use, and holding Teotihuacan-style incense burners and burials with green obsidian points. Someone built a scale quotation of a Mexican capital inside a Maya city, and it sat under the trees until a laser found it.
The argument has not stopped there. In April 2025 excavators reported a Teotihuacan-style altar at Tikal, and Stephen Houston of Brown described the period as one of extraordinary turbulence, reading the evidence as closer to occupation than to mere cultural exchange. Other researchers read the same material as elite emulation, Maya lords adopting a foreign vocabulary of power. This is actively contested, and it bears directly on how far the cosmopolitan capital reading should be pushed.
How it ended, which is also unsettled
The city's peak runs roughly 200 to 550 AD on current readings. The ceremonial core was burned, and the fire is usually dated somewhere between about 550 and 650 AD, but neither its date nor its extent is fixed. Saburo Sugiyama's team is investigating how much of the city actually burned and what sort of event it was. Popular accounts tend to give a single year and a single cause. The published evidence supports neither.
What the grid points at, and what it does not
The Street of the Dead and the Pyramid of the Sun share an axis roughly 15 degrees east of north. The published offsets differ a little with the survey and with which part of the city is measured: about 15 degrees 25 minutes to 15 degrees 28 minutes clockwise of true north for the Pyramid of the Sun and the northern and central core, and about 16 degrees 30 minutes for the Ciudadela. Ivan Šprajc's fieldwork argues that the perpendicular, east-west orientation records sunsets on 30 April and 13 August and sunrises on 11 February and 29 October, dates separated by an interval of 260 days, the length of the Mesoamerican ritual calendar. He accepts that the north-south axis also targets Cerro Gordo, the peak closing the view up the avenue, and rejects the Pleiades explanation because a stellar target would drift with precession and leave a trace in later buildings, which it does not. Whether the offset encodes a deliberate astronomical scheme at all is still disputed. One popular claim Šprajc sets aside entirely: the cave beneath the Pyramid of the Sun, long said to have determined where the city was founded, now looks to be at least partly cut by human hands, so it cannot have been the thing that chose the site.
Two newer items sit in the same file, and neither is settled. A 2024 study proposes that the Pyramid of the Moon aligns with solstice sunrises and sunsets, with consequences for how the whole grid should be read; it awaits independent verification, and until it has some we are not going to quote it as a result. Separately, an electrical resistivity survey in 2017 detected a tunnel and a chamber beneath the Pyramid of the Moon, and Nawa Sugiyama's excavation seasons at that complex have since exposed a buried staircase whose destination is not known.
What our engines found
We ran the same test here as everywhere else, with the settings fixed in advance and identical at every one of the fifty sites we cover: a 200 km search radius, at least 12 km between sampled sites, 15 sites, a 2 per cent tolerance, and 2,000 Monte Carlo runs against a null model resampled from real catalogued sites in the same region. The settings are frozen because the answer moves if you tune them, and tuning them after seeing the answer is exactly the trick we object to elsewhere. Teotihuacan returned 52 golden-ratio pairs where chance predicts 45.5, giving p = 0.2074 (run on 1 October 2026).
That is a little more than chance would predict, and it is not significant. Phi edged the control ratios here, 1.14 times its expected count against 1.09 for the best of them (2.0), but at p = 0.2074 that is well inside what chance produces.
We publish the misses because a tool that only reports its hits is not measuring anything. Every figure above is reproducible from the same coordinates, the same settings and the same seed. When the catalogue grows, the figures can move, so we rerun these tests and update this section rather than leave an old number standing.
One limit worth stating plainly, because it is the one most often glossed over. This test compares positions between monuments. It says nothing about any building's own proportions, its height, base, slope or perimeter. That is a separate question, and at several sites a genuinely open one.
Explore it yourself
Walk the grid in the Teotihuacan record in the living atlas, see the city among its catalogued neighbours and run the alignment and ley line engines on the real coordinates. The Teotihuacan Site-Emblem T-Shirt carries the Pyramid of the Sun, the site geometry and the exact coordinates.
Sources worth reading
Šprajc, I., "Astronomical Alignments at Teotihuacan, Mexico", Latin American Antiquity (2000). Gómez Chávez, S. et al., AMS radiocarbon dating of materials from the tunnel under the Temple of the Feathered Serpent, Radiocarbon (2016). Cowgill, G. L., Ancient Teotihuacan: Early Urbanism in Central Mexico, Cambridge University Press (2015). Manzanilla, L., El Inframundo de Teotihuacan (2023). Buckley et al., "Refining Ceramic Chronology and Epiclassic Reoccupation at La Ventilla, Teotihuacan Using Trapezoidal Bayesian Modeling", Radiocarbon (2023).