Mexico's Great Pyramids

This installment in the History Channel series In Search of History takes an in-depth look at a mysterious phenomenon, with this investigation into the 2000 year old Mexican city of Teotihuacan, where an epic series of pyramids loom on the landscape. Since the Teotihuacans never developed a writing system, the purpose of the pyramids remains a mystery, which scholars and archaeologists spend the program seeking to understand.