History's Greatest Mysteries

Hidden in the Nevada desert, a top-secret military base remains one of the most heavily restricted sites in the United States. Since the 1950s, speculation has swirled about its true purpose.

At the end of World War II, many Nazi officials were captured and tried for their crimes. But one of the architects of the Holocaust, Adolf Eichmann, slipped through the cracks...repeatedly eluding Nazi hunters from around the globe.

It's one of humanity's oldest nightmares-at the full moon, werewolves that once were men hunt human prey and then feast on their flesh. Stories of this terrifying transformation persist to this day.

The world's most famous painting vanishes in a daring heist, sparking international outrage and a global manhunt. A master detective is called in, who zeroes in on a handful of suspects with the motive and means to pull off the theft.

It's one of the most legendary monsters said to be lurking in the vast open seas. With stories going back hundreds of years, this elusive creature has terrorized sailors and baffled scientists.

The notorious mafia kingpin, Sam Giancana, is shot execution style in his own home. The larger-than-life mobster had many enemies, from inside the mafia to the CIA. Was his death a crime of passion? The result of unpaid debts?

A twisted mastermind uses homemade bombs to terrorize the nation...Despite one of the most extensive manhunts in U.S. history, he still manages to stay one step ahead of law enforcement for nearly two decades.

A series of shocking murders shake the city of Boston to its core. Each victim, 13 women in all, bore the signature of this serial killer: a bow wrapped around their neck.

A shot rings out from the balcony of the Ford's Theater in Washington, D.C., and America's 16th president has been killed. It has been long thought that this was the work of one man... but some believe the assassination was part of a larger plot.

An untouchable drug lord who sat atop a criminal empire and became the most wanted man in the world. For fifteen years, the U.S. and Mexico tried to hunt down El Chapo, but he was always a few steps ahead.

Bruce Lee was a seemingly invincible icon and the closest thing that we had to a real-life superhero. His athleticism and drive would change martial arts for the rest of time.

Known for their seafaring skills and feared for their ferocity, the Vikings amassed gold, silver, and other riches while trading and raiding across Europe. Caches of this treasure have been found in Europe and North America.

On December 11, 1978, a gang of thieves lift around $5 million in cash and $800,000 in jewelry from a luxury airline hangar at New York's JFK Airport, marking the largest heist in U.S. history at that time.

During World War II, a fiery phenomenon terrorizes American airmen in the night skies over Europe. The pilots call these fireballs "Foo Fighters," and swear they move at over 200 mph and defy the laws of physics. But what are they?