Experts weren't sure whether to believe Hernán Cortés' reports of an Aztec temple with a wall featuring 130,000 human skulls — until a 2017 excavation revealed the chilling truth.

The Underground Railroad was neither underground nor a railroad — but it did fight the system of slavery by secretly shepherding slaves to freedom in the North.

The night after murdering Sharon Tate and her friends, the Manson Family stabbed Leno and Rosemary LaBianca to death.

Weighing in at 2,000 pounds and sporting arm-sized fangs, the entelodont earned its status as the "hell pig" of prehistoric North America.

Patricia Krenwinkel once thought she'd become a nun. Instead, she became a part of Charles Manson's "family" and killed in his name.

Was Sirhan Sirhan really the man who killed Robert Kennedy? Or was there a larger conspiracy at play?

Discover why the wider Abraham Lincoln assassination plot was far larger than the death of one man and how this three-pronged attack sent out violent aftershocks for decades to come.

A 2017 expedition claims to have definitive evidence of a new continent about as big as India. And the discovery of Zealandia could have international economic implications.

On October 12, 1915, British nurse Edith Cavell was killed by a German firing squad for helping some 200 Allied soldiers escape German-occupied Belgium.

Though Anne's diary, friends, and family have shed some light on who Margot was, her own diary was lost and so were her own words.

Though he narrowly escaped, almost all of Bush's fellow pilots were tortured, killed, and eaten on that fateful day in September 1944 that became known as the Chichijima Incident.