History's Greatest Mysteries

An investigation into the unshakable claims of a treasure hunter.

In 1930, a New York Supreme Court justice with close ties to Tammany Hall, and future president Franklin Delano Roosevelt, steps out of a steakhouse and disappears; for decades, the case dominates mainstream media and remains unsolved.

The gruesome murder of a young beauty goes unsolved for decades; there's a long line of suspects, each more mysterious than the next.

When the infant son of an aviation legend is snatched from his crib at home, it ignites a media firestorm; after a nationwide manhunt, the supposed culprit is brought to justice, but questions pop up on the investigation.

A series of unexplained deaths near Chicago in 1982 starts a nationwide panic; the victims are connected by one frightening detail: cyanide-tainted capsules of Extra-Strength Tylenol; 40 years later, it remains an active FBI investigation.

They've been called the world's greatest archaeological enigma: 2,000-year-old geoglyphs made in the Peruvian desert that span over 50 miles; the drawings are so massive, they can only be seen from the air.

One of World War II's greatest unsolved mysteries: an incomparable work of art worth half a billion dollars, lost without a trace; perhaps the single most valuable object the Nazis ever stole, the quest for this treasure has lasted over 75 years.

During World War Two, the Nazis stole vast amounts of art, gold, silver and currency, and stashed it across Europe; while some of the plunder has been recovered, much more is still missing nearly 80 years later.

One of Germany's top military minds during WWII, General Erwin Rommel The Desert Fox, tears through North Africa.

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?

The history books say Adolf Hitler committed suicide in the final days of World War II, but not everyone believes there's sufficient proof; questions have swirled for decades about his possible escape.

Awe-inspiring and mysterious, the pyramids of Egypt are significant wonders of the ancient world; more than 4,000 years old, they are celebrated architectural marvels, but no one fully understands how they were built or why.

Hidden in the Nevada desert, a top-secret military base remains one of the most heavily restricted sites in the United States.

One of World War II's greatest unsolved mysteries: an incomparable work of art worth half a billion dollars, lost without a trace; perhaps the single most valuable object the Nazis ever stole, the quest for this treasure has lasted over 75 years.

One of Germany's top military minds during WWII, General Erwin Rommel The Desert Fox, tears through North Africa.

A series of shocking murders shake the city of Boston to its core.

The notorious mafia kingpin Sam Giancana is shot execution style in his own home.

The story of the most celebrated warrior king in history still stirs fascination more than 2000 years after his death.

It's history's most famous lost city; 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.

Hidden in the Nevada desert, a top-secret military base remains one of the most heavily restricted sites in the United States.

A series of shocking murders shake the city of Boston to its core.

A search into the extreme depths of the Bermuda Triangle, where five American torpedo bombers and the search plane dispatched to find them disappear without a trace in December 1945.

Despite centuries of sightings and searches, one deep-sea monster remains unidentified; as evidence continues to mount, the mystery endures as to whether the Loch Ness monster exists.

A medieval manuscript, which is filled with unidentifiable drawings and written in a secret language so complex that even the world's best code breakers can't crack, it has obsessed everyone from scholars to conspiracy theorists.

Known as ``The Terror of the Gulf,`` the whereabouts of Jean Lafitte's treasure remain unknown; the swamps and bayous were his base, and likely also his hiding place; treasure hunters have found very little of Lafitte's stash.

The death of one of history's most enigmatic rulers, Egypt's King Tutankhamun remains shrouded in mystery 3300 years later. Scientific advancements may be getting us closer to the identity of King Tut's killer.

This is the mystery 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, silver and jewels, hidden away thousands of years ago from Roman invaders.

Nicola Tesla had revolutionary ideas, but in the hands of the wrong people, those ideas could be used for evil purposes; when Tesla died, he allegedly had 80 trunks of papers full of ideas, but only 60 have been seen again.

It's history's most famous lost city; 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.

An event outside a U.S. Air Force base near the Rendlesham Forest in England becomes an international legend, and one of history's strangest unidentified encounters; for more than 40 years, the question has endured.

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: an island in the Pacific Ocean; the search for this flier has revealed conflicting stories.

A 200-yard swath of debris landed near Roswell, New Mexico; some believe it was an alien craft, others that it was a secret government experiment.

During World War II, Japan plunders a fortune worth hundreds of billions of dollars from occupied countries, but to this day its whereabouts are unknown.

Five years after John F. Kennedy is killed by gunshot, his brother Robert meets the same fate; an assassin's bullet again changes the course of history, and the latest clues in the case are riddled with inconsistencies.

The story of the most celebrated warrior king in history still stirs fascination more than 2000 years after his death.

For decades experts believe they know what caused the Hindenburg disaster: that leaking hydrogen--causing the airship to burst into flames; but there may be more to this story.

The death of one of history's most enigmatic rulers, Egypt's King Tutankhamun remains shrouded in mystery 3300 years later. Scientific advancements may be getting us closer to the identity of King Tut's killer.

An Aztec king's glittering treasure vanishes into thin air, inspiring a 500-year search that spans continents; one of the greatest warriors of all-time amassed a vast horde believed to be worth more than $3 billion today.

The gruesome murder of a young beauty goes unsolved for decades; there's a long line of suspects, each more mysterious than the next.

During World War II, Japan plunders a fortune worth hundreds of billions of dollars from occupied countries, but to this day its whereabouts are unknown.

They've been called the world's greatest archaeological enigma: 2,000-year-old geoglyphs made in the Peruvian desert that span over 50 miles; the drawings are so massive, they can only be seen from the air.

A look at what could cause mysterious vanishings in the Bermuda Triangle, a 500,000 square mile area of the Atlantic where ships, planes and unsuspecting travelers have been lost without a trace.

A 200-yard swath of debris landed near Roswell, New Mexico; some believe it was an alien craft, others that it was a secret government experiment.

Awe-inspiring and mysterious, the pyramids of Egypt are significant wonders of the ancient world; more than 4,000 years old, they are celebrated architectural marvels, but no one fully understands how they were built or why.

In 1930, a New York Supreme Court justice with close ties to Tammany Hall, and future president Franklin Delano Roosevelt, steps out of a steakhouse and disappears; for decades, the case dominates mainstream media and remains unsolved.

In 1997, thousands of people across Phoenix witness a series of strange lights unlike anything they've ever seen; many think this could be one of the largest-scale UFO sightings in history, but there may be another explanation.

In 1587, a group of settlers land off the coast of North Carolina on Roanoke Island to establish the first English Colony in America; a few years later, the 115 men, women and children vanish without a trace, leaving only cryptic clues.

On November 22, 1963, President John F Kennedy is assassinated, shaking the nation to its core; while an initial suspect is captured, many believe there's more to the story; investigators and amateur sleuths alike have been searching for answers.

Despite centuries of sightings and searches, one deep-sea monster remains unidentified; as evidence continues to mount, the mystery endures as to whether the Loch Ness monster exists.

A series of unexplained deaths near Chicago in 1982 starts a nationwide panic; the victims are connected by one frightening detail: cyanide-tainted capsules of Extra-Strength Tylenol; 40 years later, it remains an active FBI investigation.

When the infant son of an aviation legend is snatched from his crib at home, it ignites a media firestorm; after a nationwide manhunt, the supposed culprit is brought to justice, but questions pop up on the investigation.

A medieval manuscript, which is filled with unidentifiable drawings and written in a secret language so complex that even the world's best code breakers can't crack, it has obsessed everyone from scholars to conspiracy theorists.

For decades experts believe they know what caused the Hindenburg disaster: that leaking hydrogen--causing the airship to burst into flames; but there may be more to this story.

An investigation into the unshakable claims of a treasure hunter.

A search into the extreme depths of the Bermuda Triangle, where five American torpedo bombers and the search plane dispatched to find them disappear without a trace in December 1945.

Investigator Ben Smith travels to Jesse Marcel's hometown on Louisiana's Gulf Coast to speak with family members who reveal information that supports Marcel's story of a government coverup.

A former CIA operative's investigation into the Roswell crash arrives at a critical moment when the mysterious journal found among the possessions of Maj. Jesse Marcel undergoes a crucial test.

A cryptic journal sparks an unprecedented investigation into whether a UFO crashed at Roswell, N.M., in 1947; Major Jesse Marcel's journal may contain coded clues to the truth behind Roswell.

Booth family members share family lore, and what they believe is evidence of the assassin's escape, passed down through generations.

With over 7,500 hours investigating the mystery; top D.B. Cooper expert Eric Ulis believes that he's found the true location where Cooper landed during his daring dive.

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?

The history books say Adolf Hitler committed suicide in the final days of World War II, but not everyone believes there's sufficient proof; questions have swirled for decades about his possible escape.

During World War Two, the Nazis stole vast amounts of art, gold, silver and currency, and stashed it across Europe; while some of the plunder has been recovered, much more is still missing nearly 80 years later.

On November 22, 1963, President John F. Kennedy was assassinated, shaking the nation to its core; while an initial suspect is captured, many believe there's more to the story; investigators and amateur sleuths alike have been searching for answers.

Five years after John F. Kennedy is killed by gunshot, his brother Robert meets the same fate; an assassin's bullet again changes the course of history, and the latest clues in the case are riddled with inconsistencies.

Booth family members share family lore, and what they believe is evidence of the assassin's escape, passed down through generations.

With over 7,500 hours investigating the mystery; top D.B. Cooper expert Eric Ulis believes that he's found the true location where Cooper landed during his daring dive.

In 1587, a group of settlers land off the coast of North Carolina on Roanoke Island to establish the first English Colony in America; a few years later, the 115 men, women and children vanish without a trace, leaving only cryptic clues.

An Aztec king's glittering treasure vanishes into thin air, inspiring a 500-year search that spans continents; one of the greatest warriors of all-time amassed a vast horde believed to be worth more than $3 billion today.

A cryptic journal sparks an unprecedented investigation into whether a UFO crashed at Roswell, N.M., in 1947; Major Jesse Marcel's journal may contain coded clues to the truth behind Roswell.

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: an island in the Pacific Ocean; the search for this flier has revealed conflicting stories.

Nicola Tesla had revolutionary ideas, but in the hands of the wrong people, those ideas could be used for evil purposes; when Tesla died, he allegedly had 80 trunks of papers full of ideas, but only 60 have been seen again.

A former CIA operative's investigation into the Roswell crash arrives at a critical moment when the mysterious journal found among the possessions of Maj. Jesse Marcel undergoes a crucial test.

Investigator Ben Smith travels to Jesse Marcel's hometown on Louisiana's Gulf Coast to speak with family members who reveal information that supports Marcel's story of a government cover-up.