Known as :The Terror of the Gulf"; the whereabouts of Jean Lafitte's treasure remains 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 Titanic's tragic story captures the imagination of the public and experts of all kinds, who--decades after the ship's demise--still seek answers. Can new evidence reveal more about how--and why--the Titanic sank?

The gigantic statues of Easter Island have mystified humanity for centuries; how in the world did an ancient civilization, with only primitive tools, carve and then move thousands of these rock monuments around the island, and why?

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. 800 years later, the fate of his treasure remains a mystery. Where are Genghis Khan's buried riches?

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 perfectly masterminded plot leads to one of the most brazen prison breaks in American history. With only a handful of clues left behind, the search for the infamous Alcatraz escapees continues to this day. But is it really possible they survived -- and if so, where did they go?

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. Who is really behind the killing of Robert Kennedy, and why?

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. That disappearance sparks a search for clues spanning nearly two centuries and leads to unthinkable ends. What really killed the men of the Franklin Expedition?

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.

As the Cold War ramps up, a well-dressed man is found dead within miles of a nuclear testing site on a tranquil Australian beach. There are no clues to his identity, or what could have happened. It's a case that's obsessed an army of sleuths for over 70 years: Who is the Somerton Beach man, and how did he die?

One of the most chilling aviation mysteries in modern day: a Boeing 777, carrying 239 people, vanishes over the Indian Ocean; nearly a decade later, no one knows what really happened to Malaysia Flight 370.

She was the last pharaoh of Egypt and one of the most famous queens of all time, but her death in 31 B.C. has been shrouded in mystery. Cleopatra's body and final resting place have been lost without a trace for over 2,000 years, leaving the world's top archaeologists baffled. Can new evidence finally uncover Cleopatra's missing tomb?

For decades, experts believed they knew what caused the Hindenburg disaster that leaking hydrogen and ignited, causing the airship to burst into flames. But there may be more to this story. Whatever triggered the explosion, it didn't just spell doom for the Hindenburg but for the entire rigid airship industry. What caused the Hindenburg Disaster?

An infamous Cold War cold case involving nine hikers found mutilated on a remote mountain slope; for over 60 years, authorities and amateurs alike have been trying to figure out what happened in a place that's been called "Russia's Area 51."

A spree of gruesome murders shocks Victorian England--and the world. The homicidal maniac responsible remains a mystery. Can history's most notorious serial killer ever be identified? Who is Jack the Ripper?

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.

In July 1996, one of the worst aviation disasters in American history leaves 230 people dead and countless questions unanswered; it's a tragedy that changes the aviation industry forever.

With 500-year-old secrets hidden in skeletons and stone, Machu Picchu is one of the most puzzling archaeological sites on earth. It's among the ancient world's most enduring riddles: Who built this astonishing complex, and why?

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, a tiny island in the Pacific Ocean. The search for this famed flier has revealed conflicting stories and in the eyes of some, secrecy. What really happened to Amelia and her navigator?

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.

A dust-covered box hidden in a British manor house for 108 years contains the personal notes of Lord Mersey, the respected British jurist and politician charged with investigating the sinking of the Titanic in 1912.

A powerful union activist disappears from a Detroit suburb; 45 years later, it remains one of the most notorious missing person cases of all time; the mystery of Jimmy Hoffa's disappearance features more twists and turns than a Hollywood movie.

It might be the world's most mysterious book: a medieval manuscript filled with unidentifiable drawings, written in a secret language so complex that even the world's best code breakers can't crack it. It's obsessed everyone from scholars to conspiracy theorists. What is the Voynich Manuscript? And who wrote it?

Cash, jewels and two million dollars in gold bars. Jesse James and his gang robbed trains, stagecoaches and banks They 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?

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. Finding Atlantis would not only be the archaeological coup of this century, but perhaps for all time. Is Atlantis a a real place, and if so, where could it be?