A rock that archaeologists believe was used in sacrifice rituals, recently discovered at the archaeological site Templo Mayor, sits on display in Mexico City, Friday, Oct. 5, 2012. Mexican archaeologists say they have found the largest amount of skulls, along with this stone, at the most sacred temple of the Aztec empire dating back more than 500 years. (AP Photo/Alexandre Meneghini)

Associated Press
A rock that archaeologists believe was used in sacrifice rituals, recently discovered at the archaeological site Templo Mayor, sits on display in Mexico City, Friday, Oct. 5, 2012. Mexican archaeologists say they have found the largest amount of skulls, along with this stone, at the most sacred temple of the Aztec empire dating back more than 500 years.  (AP Photo/Alexandre Meneghini)
A rock that archaeologists believe was used in sacrifice rituals, recently discovered at the archaeological site Templo Mayor, sits on display in Mexico City, Friday, Oct. 5, 2012. Mexican archaeologists say they have found the largest amount of skulls, along with this stone, at the most sacred temple of the Aztec empire dating back more than 500 years. (AP Photo/Alexandre Meneghini)
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