Around 100 BC, settlers began raising the city that would become the largest urban center in the pre-Columbian Americas, on a semi-arid plateau roughly 50 kilometers northeast of modern Mexico City. No written records survive, so the builders remain anonymous — a collective mystery that every teotihuacan from mexico city tour eventually confronts. Construction of the Pyramid of the Sun, still one of the world's largest structures by volume, was largely complete by 100 AD, using an estimated 1.25 million cubic meters of fill, all moved without wheeled transport or draft animals. The Street of the Dead, the ceremonial spine of the city, was laid out on an axis deliberately offset 15.5 degrees east of true north, aligning the Pyramid of the Sun with the setting of the Pleiades — a calendrical decision whose full significance remains debated.
At its peak between 350 and 550 AD, the city housed an estimated 100,000 to 200,000 inhabitants, making it the sixth-largest city on Earth at the time. Obsidian workshops, pottery districts, and foreign enclaves — including quarters identified as Oaxacan and Gulf Coast — point to a cosmopolitan trade network stretching across Mesoamerica. The talud-tablero architectural form pioneered here spread as far as the Maya lowlands, carried by influence, migration, and possibly military projection. Murals uncovered at Tepantitla depict a rain deity presiding over a paradise of flowing water and singing figures, offering rare glimpses into religious life.
Sometime between 550 and 650 AD, the city's ceremonial core was systematically burned and smashed — evidence of internal revolt rather than foreign conquest, according to most current scholarship. Population collapsed, the urban grid was abandoned, and the site lay partially buried for centuries. When Aztec pilgrims arrived around the 14th century, they named it Teōtīhuacān, meaning "the place where the gods were created," incorporating it into their own cosmological origin myth. Teotihuacan from mexico city visitors today inherit that Aztec framing, walking avenues the Aztecs themselves walked in reverence. Modern excavations, including the 2003 discovery of the Feathered Serpent Pyramid tunnel and its sealed chambers, continue to revise understanding of this metropolis, confirming that its rulers, its fall, and its founding population are still subjects of active archaeological inquiry.
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