Teotihuacan

Origin Story

Construction at Teotihuacan began around 200 BCE and the city grew to dominate the Basin of Mexico for nearly a thousand years, with its largest monument, the Pyramid of the Sun, substantially complete by around 100 CE. By the time the Aztecs encountered the ruins centuries after its collapse, they had no idea who had built it. They gave it its current name, meaning roughly "place where the gods were created," and treated it as a sacred ruin from a vanished people.

Evidence & Claims

At its height between 350 and 650 CE, Teotihuacan held an estimated 100,000 to 250,000 residents, making it one of the largest cities anywhere in the world at the time, with a planned grid layout and apartment-style residential compounds. Archaeologists have found no evidence of a single ruling dynasty or named king, unusual for a city of its size and era, along with clear evidence that Maya, Zapotec, and Mixtec people all lived within it, suggesting an unusually multi-ethnic, possibly collectively governed metropolis rather than rule by one cultural group.

Skeptical Explanations

An older theory crediting the later Toltec civilization with building the city has been discredited, since Teotihuacan's decline predates the Toltecs' rise by centuries. The leading explanation for its identity gap is simply that no contemporary written language or king list from Teotihuacan itself has survived for archaeologists to read, leaving its builders' ethnic and political identity as Mesoamerica's most prominent open question; the city's eventual decline around 550 CE is now most often attributed to internal unrest, evidenced by burn damage to elite buildings, compounded by a drought possibly tied to a global climate disruption in 535–536 CE.

About an hour northeast of Mexico City by road. The site has several gates, with Gate 1 the main entrance; admission covers both pyramids and the on-site museums.