A skull from the recently discovered Xaloctan site is displayed at the National Institute of Anthropological Studies at Mexico's National Autonomous University in Mexico City, Friday, Feb. 8, 2013. Archaeologists say they have turned up about 150 skulls of human sacrifice victims at a field in Xaloctan, central Mexico near the Teotihuacan pyramids. Experts are puzzled by the unexpected find of such a large number of skulls at what appears to have been a small, unremarkable shrine. The heads were carefully deposited in rows or in small mounds, mostly facing east toward the rising sun, sometime between 660 and 860 A.D. (AP Photo/Dario Lopez-Mills)
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