These six "experiments" by Unit 731 rank among some of the most horrifying war crimes ever committed — and they went virtually unpunished.

Though believers say that the prophet Moses, Paul the Apostle, and God Himself are the main authors who wrote the Bible, the historical evidence is more complicated.

Construction on California City started in 1958, and its developer hoped that it would one day be larger than L.A. or San Francisco — but more than 60 years later, its population has yet to break 15,000.

Explore the haunting story of the Radium Girls, a group of women exposed to lethal amounts of radium while working in watch factories in early 20th-century America.

While reigning as the autocratic ruler of the Congo Free State from 1885 to 1908, King Leopold II of Belgium may have killed as many as 15 million people.

The photo of "Napalm Girl'' depicting nine-year-old Phan Thi Kim Phúc running from a South Vietnamese airstrike shocked the world in 1972. But there's a lot more to her story.

Black Liberation activist Assata Shakur was found guilty of killing a police officer in 1977, only to escape prison two years later and become a political refugee in Cuba.

In July 1947, something crashed on the Foster Ranch in New Mexico. What that object was, what the government said it was, and what the public thought it could be has created a near-mythical confusion that has lasted ever since.

A notorious SS officer and physician, Josef Mengele sent over 400,000 people to their deaths at Auschwitz during World War II — and never faced justice.

After 30 years of solemnly pledging "never again," the world stood by and watched in horror as another genocide unfolded — this time in Cambodia under Pol Pot.

Was Jesus white, Black, or another race entirely? Go inside the complicated history of what color Jesus of Nazareth may have been.