A team of explorers discover a forbidding cave system riddled with ancient markings that seem to contain a mysterious meaning; using advanced photogrammetry, experts finally decode these cryptic scrawls to expose a dark chapter of English history.

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.

Experts reveal the mystery behind a macabre scene of ancient execution.

When experts discover a 500-year-old grave, they find mysterious red skulls, pointing to a shocking mass sacrifice; experts use the latest technology and state-of-the-art forensics to investigate what happened at this horrific sight.

Experts reveal the mystery behind a red skeleton adorned with jewels.

A temple to the Roman god of the underworld was the site of ritual sacrifice and a gate to the underworld, but it was buried because it was believed to be cursed; experts use cutting-edge forensics to reveal what actually happened here.

Experts investigate the mummies of three children discovered in Argentina.