The Mola Mola, or ocean sunfish, is one of the world's heaviest bony fish, growing up to 5,000 pounds and 14 feet long.

James "Whitey" Bulger, one of America's most dangerous mob leaders, lived a double life as an FBI collaborator. But who was working for who?

The Cultural Revolution was one of the bloodiest eras in China's history in which 1.5 million people died — and it lasted but 10 years.

Reinhard Heydrich had many nicknames: "the Blond Beast," "the Hangman," and "the Butcher of Prague" — but none of them quite captured just how ruthless he was.

Millionaire John du Pont was certainly eccentric, but Dave Schultz never anticipated that he could be a murderer.

For 30 years, the Boy Scout troop leader and church council president committed unspeakable horrors against his neighbors, all the while completely unsuspicious to even his own wife.

Known to most as a soft man, the folklore that surrounded Wild Bill was often met with a heavy grain of salt.

The "Swamp Sasquatch" known as the Florida Skunk Ape is a 6'6", 450-pound hairy, smelly ape that roams the Everglades — or so believers say.

Gary Heidnik didn't just kidnap, torture, and murder women in the basement of his house of horrors — he got one of his victims to help.

Sylvia Likens and her sister Jenny were left in the care of a family friend who tortured Sylvia mercilessly until the young woman died of her extensive, gruesome, injuries.

The Haymarket Riot started with a single stick of dynamite — and culminated in a wave of paranoia, police injustice, and activism that changed labor laws around the world.