Archaeologists excavating a historic Chilean site make a chilling discovery and find decapitated human skulls separate from a nearby burial site; experts use advanced cranial forensics to reveal what really happened to these ancient, butchered victims.

A gruesome archaeological discovery leads to a shocking excavation that uncovers ancient human carnage on a scale that's unparalleled; experts use 3-D bone modeling to reveal evidence of what may be the first catastrophic, major war in human history.

Archeologists make a bone-chilling discovery when they unearth 20 mutilated skeletons in Mexico; investigators use advanced forensic analysis to examine the bizarre burial and reveal an ancient case of Mayan mass murder.