New Digs Decoding Mexico's "Pyramids of Fire"

Using picks, shovels, and high-tech forensic sleuthing, scientists are beginning to cobble together the grisly ancient history and fiery demise of Teotihuacán, the first major metropolis of the Americas.

The size of Shakespeare's London, Teotihuacán was built by an unknown people almost 2,000 years ago. The site sits about 25 miles (40 kilometers) north of present-day Mexico City. Temples, palaces, and some of the largest pyramids on Earth line its ancient main street.

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