Inside the Aktion T4 program, the little-known Nazi euthanasia initiative that killed as many as 300,000 disabled people.

Billy the Kid packed more into his 21 years than most outlaws do into a lifetime.

After a childhood of abuse and abandonment, Aileen Wuornos went on a killing rampage that made her America's most infamous female serial killer.

The Roswell incident is the most famous event in extraterrestrial lore. But, there's more to the story than government conspiracies and flying saucers.

These facts about the Leaning Tower of Pisa reveal everything there is to know about the world's most famous architectural mistake.

Set aside what religious tradition says, and discover who wrote the Bible according to the scholars who have examined the actual evidence.

From New York City's most feared creature to an insect that can kill you with its feces, these house bugs are beyond horrifying.

What really happened to the Führer? These Hitler death conspiracy theories, from the plausible to the outlandish, claim to have the answers.

For decades before and after Mary Shelly's book, several prominent scientists were putting serious brainpower into real Frankenstein experiments by using the then-magical power of electricity.

From his love of cigars to his actual lover, no idea was a bad idea when it came to Fidel Castro assassination attempts.

How Patty Hearst went from wealthy heiress to gun-toting, bank-robbing, radical militant of the Symbionese Liberation Army.