Drawn together by shared childhood trauma, Henry Lee Lucas and Ottis Toole became lovers — then serial killers who terrorized America in the 1970s.

In the late 1970s, up to 3 million people died in the Killing Fields of the Cambodian genocide. This is what it looked like.

The Ukrainians call the famine the "Holodomor," a name that means "murder through starvation."

These rarely-seen photographs of the Kent State Massacre provide a harrowing look at the day the '60s died.

How "Wild Bill" Hickok rose from humble Quaker roots in Illinois to become a legendary lawman and gunslinger of the Wild West.

While being on the spectrum can sometimes create challenges, these famous people with autism have been able to use their unique way of seeing the world to achieve great feats.

Adolf Hitler literally trusted Erwin Rommel with his life. He never could have expected that in 1944, the "Desert Fox" would join a conspiracy to assassinate him.

Thousands of poorly trained kamikaze pilots were asked to sacrifice their lives for Japan's collapsing war effort, but the letters they left behind reveal they weren't all eager volunteers.

See rare images of the Indigenous Inuit people who thrived in the Arctic regions of Canada, Alaska, and Greenland before they were forcibly relocated and their culture was all but erased.

In June 1943, white mobs attacked young men of color, especially Mexican-Americans, who were wearing the trendy, loose-fitting style known as a "zoot suit."