In this June 20, 2012 image courtesy of Christopher T. Morehart released on Jan. 31, 2013, archaeologists work at the site where skulls were found in a field in Xaltocan, near the Teoti

 

              In this June 20, 2012 image courtesy of Christopher T. Morehart released on Jan. 31, 2013, archaeologists work at the site where skulls were found in a field in Xaltocan, near the Teoti
In this June 20, 2012 image courtesy of Christopher T. Morehart released on Jan. 31, 2013, archaeologists work at the site where skulls were found in a field in Xaltocan, near the Teotihuacan pyramids in central Mexico. Georgia State University archaeologist Christopher Morehart found about 150 skulls of human sacrifice victims in this field, one of the first times that such a large accumulation of severed heads has been found outside of a major pyramid or temple complex in Mexico. (AP Photo/Christopher Y. Morehart)