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.
Most people know it as the biblical birthplace of man -- the Garden of Eden; investigating if the Garden of Eden was just a story to explain human creation or if it was a real place.
A look at what happened to the secret hoard of the Knights Templar, a treasure of gold, silver, gems and religious relics protected by a medieval religious order.
The haunting image of the Shroud of Turin has captivated millions around the world; scientists and theologians are trying to figure out if the Shroud of Turin truly is an image of Jesus or something very different.
In 1698, Capt. William Kidd raids a ship on the high seas and seizes its vast treasure, but Kidd is hanged before revealing where he stashed the loot; a look at what happened to the lost booty and where it is now.
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.
On February 24, 1942, less than three months after the Japanese bombed Pearl Harbor, military radar picks up what appears to be enemy aircraft over Los Angeles.
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.
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 story of the most celebrated warrior king in history still stirs fascination more than 2000 years after his death.
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; a look into new evidence that might reveal more about how and why the Titanic sank.
The search for the most famous gold mine in the Old West has led many to perish in the pursuit of its elusive riches.
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.
A notorious tragedy leads to one of the darkest chapters in early American history; in 1692, fear rips through the small town of Salem, Massachusetts; accusations fly and many people are put to death.
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.
In 1969, a serial killer taunts investigators with cryptic ciphers, leaving police and the public questioning his identity for over 50 years; new evidence and technology may finally be able to crack his code and discover who the Zodiac Killer is.
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.
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.
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.
A holy relic from the Bible has been missing for over 2,000 years; while some believe the Ark of the Covenant was destroyed, many people think it's still out there; new clues could finally explain what happened.
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.
One of history's most notorious pirates, Blackbeard, is said to have had a treasure worth millions of dollars; after centuries of searching, the legendary hoard remains missing.
An ancient mechanical device found on a 2,000-year-old shipwreck has become known as the world's first computer; the machine is centuries more advanced than historians thought possible, but its origin and true purpose are shrouded in secrecy.
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.
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.
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.
It's the only unsolved air piracy case in history; in 1971, a man hijacks a Northwest Orient Airlines flight, demanding four parachutes and $200,000; he jumps out of the plane with the money and is never seen again.
Thousands of people swear they've encountered the legendary North American creature Bigfoot, but Bigfoot has never been officially identified; as evidence continues to mount, and photos are scrutinized, the mystery endures.
It's one of the most famous prehistoric monuments on Earth -- a mysterious arrangement of stones that have adorned the English countryside for millennia; nobody knows how the landmark was built or why.
It is a legendary ancient city, said to be overflowing with gold; for centuries, explorers put their lives on the line searching for it; the quest to uncover this infamous city continues.
In 2016, a mysterious illness strikes dozens of government officials in Cuba; hundreds more are afflicted.
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.
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.
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.
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 II, Japan plunders a fortune worth hundreds of billions of dollars from occupied countries, but to this day its whereabouts are unknown.
The gruesome murder of a young beauty goes unsolved for decades; there's a long line of suspects, each more mysterious than the next.
In a perfectly planned robbery, thieves steal half a billion dollars in masterpieces from the Gardner Museum in Boston; it's been three decades since the brazen heist, and an exhaustive search has failed to recover the stolen goods.
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.
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.
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."
After a series of dark and ominous events, an unassuming family home on Long Island becomes the most notorious house in America; 50 years later, it's spawned a title wave of books, documentaries, and films.
It's a treasure coveted by everyone from Roman emperors to Adolf Hitler; a sacred object said to hold incredible powers of healing, resurrection and immortality, the Holy Grail is the most sought-after relic in the world.
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.
On Christmas morning in 1945, five siblings vanish from their family home in West Virginia during a raging fire; despite the work of dozens of investigators and thousands of amateur sleuths, the mystery remains.
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.
A spree of gruesome murders by Jack the Ripper shocks Victorian England -- and the world; the homicidal maniac's identity still remains a mystery.
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.
In Christianity's medieval battle to retake the Holy Land from Islam, the failure of wealthy Crusaders left a growing number of disgruntled Europeans.
Following news of the history-making discovery of Sir Ernest Shackleton's ship the Endurance, this is a look at his historic and ill-fated 1914 Antarctic expedition resulting in the loss of the highly revered ship.
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.
An investigation into the unshakable claims of a treasure hunter.
Magician and Houdini expert Bill Kalush secures access to Harry Houdini's diary previously kept from the public; experts begin to unveil the diary, using information gleaned from these personal accounts to form new insights into Houdini's life.
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.
Booth family members share family lore, and what they believe is evidence of the assassin's escape, passed down through generations.
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.
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 coverup.