When Mexican police found a pile of about 150 skulls in a cave near the Guatemalan border, they thought they were looking at a crime scene, and took the bones to the state capital.
It turns out it was a very cold case.
It took a decade of tests and analysis to determine the skulls were from sacrificial victims killed between A.D. 900 and 1200, the National Institute of Anthropology and History said Wednesday.
[...] experts said Wednesday the victims in the cave had probably been ritually decapitated and the skulls put on display on a kind of trophy rack known as a "tzompantli." Spanish conquistadores wrote about seeing such racks in the 1520s, and some Spaniards' heads even wound up on them.