It was massive, one of the first great cities of the Western Hemisphere. And its origins are a mystery.

It was built by hand more than a thousand years before the swooping arrival of the Nahuatl-speaking Aztec in central Mexico. But it was the Aztec, descending on the abandoned site, no doubt falling awestruck by what they saw, who gave it a name: Teotihuacan.

A famed archaeological site located fewer than 30 miles (50 kilometers) from Mexico City, Teotihuacan reached its zenith between 100 B.C. and A.D. 650. It covered 8 square miles (21 square kilometers) and supported a population of a hundred thousand, according to George Cowgill, an archaeologist at Arizona State University and a National Geographic Society grantee.

"It was the largest city anywhere in the Western Hemisphere before the 1400s," Cowgill says. "It had thousands of residential compounds and scores of pyramid-temples and was comparable to the largest pyramids of Egypt."

Oddly, Teotihuacan, which contains a massive central road (the Street of the Dead) and buildings including the Temple of the Sun and the Temple of the Moon, has no military structures—though experts say the military and cultural wake of Teotihuacan was heavily felt throughout the region.

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