History's Greatest Mysteries

An Aztec king's glittering treasure vanishes into thin air, inspiring a 500-year search that spans continents. What really happened to Montezuma's lost treasure?

We look into the top theories behind the location of the Garden of Eden. Is it a physical place or a metaphor for a great migration?

On February 24, 1942, military radar picks up what appears to be enemy aircraft over Los Angeles. Sirens send citizens scrambling, as troops fire artillery at the illusive targets. What exactly triggered the so-called Battle of Los Angeles?

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?

The story of the most celebrated warrior king in history still stirs fascination more than 2,000 years after his death. But the location of his body is the subject of much debate.

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 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. But what really sparked the Salem Witch Trials?

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.