Teotihuacan: City of the Gods

In 1983, workers laying a drainage pipe along the Avenue of the Dead struck something unexpected: a tunnel entrance. Archaeologists followed it. It led 100 meters beneath the Temple of the Feathered Serpent to a series of chambers that had been sealed for roughly 1,800 years. Inside were extraordinary ritual objects: jade figurines, magnetite mirrors, pyrite discs, rubber balls, jaguar bones, seeds, and nearly 100,000 individual offerings. In a side chamber, they found a miniature landscape — a stone box filled with loose pyrite — and, pooled across the floor, liquid mercury.

No one has fully explained what the mercury was for.

The Place

Teotihuacan sits in the Valley of Mexico, about 40 kilometers northeast of modern Mexico City, in the state of Mexico. The site sprawls across roughly 21 square kilometers, making it one of the largest planned cities of the ancient world. Its two main pyramids — the Pyramid of the Sun and the Pyramid of the Moon — are connected by the Avenue of the Dead, a 2.5-kilometer processional boulevard that runs roughly north-south through the city center.

The Pyramid of the Sun is staggering in scale: 65 meters tall with a base covering roughly the same area as the Great Pyramid of Giza. It contains approximately 1.2 million tons of stone and earth. Beneath it, a natural cave system — later expanded into a clover-shaped chamber — was almost certainly considered a sacred portal to the underworld by the city's builders.

At its peak between 1 and 500 AD, Teotihuacan housed somewhere between 100,000 and 125,000 people, making it potentially the largest city in the Western Hemisphere and one of the largest anywhere on Earth at that time. It dominated Mesoamerican trade and culture for centuries.

And yet: we don't know who built it. The people who created Teotihuacan left no deciphered writing, no clear royal tombs, no established succession of rulers. They were later absorbed, destroyed, or moved on before the Aztecs arrived to name their abandoned city "the place where the gods were created" — or, alternately, "the place where men become gods."

What the Show Claims

Ancient Aliens visited Teotihuacan in Season 1, Episode 3, Season 3, Episode 6, and Season 12, Episode 7, among others.

The show's arguments cluster around several specific anomalies. First, the name: "the place where men become gods" is presented as literal — Teotihuacan was, the theorists argue, a site for alien-assisted transformation or ascension, a platform for beings traveling between human and divine (i.e., extraterrestrial) existence.

Second, the layout: several researchers featured in the show have argued that the positions of the Avenue of the Dead and the pyramids mirror the layout of the solar system, with the three pyramids corresponding to the inner planets. This claim was popularized by engineer and author Stanislav Ivanov in the 1970s.

Third, and more concretely: mica. Large deposits of mica — a mineral used in modern electronics as an electrical insulator and thermal barrier — were found in a specific layer of the Pyramid of the Sun and in a dedicated "Mica Temple" discovered in the 1900s. The show argues that mica's industrial uses suggest Teotihuacan housed technology that required electrical insulation, pointing to advanced alien machinery.

The liquid mercury beneath the Temple of the Feathered Serpent — discovered by archaeologist Sergio Gómez Chávez in 2015 — gets significant attention. Mercury requires sophisticated processing to produce in large quantities, and its presence in a sealed ceremonial chamber is unexplained by standard ritual purposes.

What Archaeology Says

The planetary layout claim hasn't survived scrutiny. When examined carefully against actual solar system proportions, the match is poor — the distances and angles don't correspond with the precision the theory requires. The claim relies on selective measurement and has not been published in peer-reviewed archaeological or astronomical literature.

The mica question is more interesting. Mica was indeed traded across enormous distances in Mesoamerica — the deposits at Teotihuacan originated from Brazil, roughly 2,000 miles away. Archaeologist Saburo Sugiyama of Aichi Prefectural University has noted that mica appears in ritual contexts at Teotihuacan and at other Mesoamerican sites, suggesting it was valued for its optical properties — its shimmer and reflectivity — rather than its electrical characteristics. A floor covered in reflective mica would create a striking visual effect in firelight, consistent with ceremonial use.

The mercury is genuinely puzzling, and archaeologists are still working on it. The leading hypothesis, developed by Leonardo López Luján of Mexico's National Institute of Anthropology and History, is that the mercury pool represented an underworld river — specifically, the primordial waters described in Mesoamerican cosmology that the souls of the dead must traverse. This interpretation is consistent with other objects in the tunnel, which appear to be offerings related to the underworld and ritual sacrifice.

The tunnel and chamber complex beneath the Temple of the Feathered Serpent has also yielded evidence of something unusual: the walls and floors were covered in pyrite and magnetite dust, creating a surface that, under firelight, would have shimmered like a night sky. The combined effect of the glittering surfaces, the offerings, and the mercury would have been extraordinary — a ritual theater of some kind, designed for experiences we can barely imagine from the outside.

The Verdict

Teotihuacan's anonymity is its deepest mystery. The builders of one of the ancient world's greatest cities chose — or were forced — to leave no legible record of who they were. The city was deliberately burned around 550 AD, its palaces and elite structures torched while residential areas seem to have been left intact. This suggests internal conflict rather than external conquest, but we don't know who the factions were or what the burning meant.

The mica and mercury get the most attention in alternative archaeology, but the more interesting puzzle might be simpler: how did a city of 100,000 people function with what appears to be either no centralized ruler or a very different form of governance than anything else we know from the ancient world? The absence of royal tombs and clear dynastic imagery suggests Teotihuacan may have been organized around collective or religious authority rather than individual kingship.

When you walk the Avenue of the Dead and climb the Pyramid of the Sun, the scale makes a real demand on you. Something genuinely extraordinary happened here — built by people whose names we don't know, for purposes we're still reconstructing, across a span of centuries. That's not an alien mystery. It's a human one, and somehow that makes it harder to let go of.