History's Greatest Mysteries

It's one of America's most mythic UFO incidents--a 200-yard swath of debris that landed near Roswell, New Mexico. Some believe it was an alien craft, others that it was a secret government experiment.

The search for the illusive Northwest Passage leads to a historic expedition that sets sail into a labyrinth of ice and is never heard from again. What really killed the men of the Franklin Expedition?

On February 14th, 1929, one of the most shocking murders in mob history goes down in Chicago--and becomes known as the Valentine's Day Massacre.

Sightings of the Yeti, a creature of myth and legend, has been recorded for thousands of years throughout the Himalayas and surrounding regions.

Amelia Earhart, the world's most famous female pilot, takes off on the final leg of a record-breaking flight. But Earhart never arrives at her next stop. What really happened to Amelia and her navigator?

Pablo Escobar, the notorious narco-trafficker who single-handedly supplied most of America's cocaine in the 1980s, had billions of dollars in cash...and hid stacks of it all over the country. Who killed Pablo Escobar? And where did all his money go?

Cash, jewels, and two million dollars in gold bars. Jesse James and his gang robbed trains, stagecoaches and banks and buried the spoils. But only a fraction of the millions has actually been found. If James and his gang hid a fortune, where could it be?

Cash, jewels, and two million dollars in gold bars. Jesse James and his gang robbed trains, stagecoaches and banks and buried the spoils. But only a fraction of the millions has actually been found. If James and his gang hid a fortune, where could it be?

A surreal event outside a US Air Force base near the Rendlesham Forest in England becomes an international legend, and one of history's strangest unidentified encounters. What were the Rendlesham lights?

The Burning Bush, the 10 Plagues, the Parting of the Red Sea...these legendary Biblical events in the Book of Exodus have shaped Judeo Christian beliefs for centuries.

The Burning Bush, the 10 Plagues, the Parting of the Red Sea...these legendary Biblical events in the Book of Exodus have shaped Judeo Christian beliefs for centuries.

It's history's most famous lost city: Atlantis, the island kingdom that's baffled explorers for centuries. Some say Atlantis is a myth, while others insist it was a very real place wiped out thousands of years ago.

He was the first Public Enemy Number One--the legendary outlaw John Dillinger. His life consisted of brazen bank robberies across the country, but his death remains shrouded in mystery. What really happened to John Dillinger?

He was the first Public Enemy Number One--the legendary outlaw John Dillinger. His life consisted of brazen bank robberies across the country, but his death remains shrouded in mystery. What really happened to John Dillinger?

The legendary ancient ruler who amassed a fortune estimated to be worth 120 trillion in today's dollars--Genghis Khan--hid his riches so well that to this day no one has unearthed them. Where are Genghis Khan's buried riches?

The legendary ancient ruler who amassed a fortune estimated to be worth 120 trillion in today's dollars--Genghis Khan--hid his riches so well that to this day no one has unearthed them. Where are Genghis Khan's buried riches?

Nicola Tesla is the epitome of what some would call the "mad scientist" and also one of history's most influential inventors.

This is the most mysterious of the Dead Sea Scrolls. An ancient treasure map, recorded on a rare Copper Scroll, could lead to billions of dollars of buried treasure in gold, in silver, in jewels, hidden away thousands of years ago from Roman invaders.

It's one of the most infamous and unsolved mob murders--notorious mobster Bugsy Siegel is gunned down in his Beverly Hills living room.

One of the most famous explorers in the world, Percy Fawcett, becomes obsessed with a lost city deep in the Amazon jungle, a place he names the City of Z.

Rising from the sands of the Egyptian desert is one of the ancient world's greatest wonders--the mighty Sphinx. This mythological creature, with the head of a human and the body of a lion, looks like it's standing guard at the great pyramids of Giza.