History's Greatest Mysteries 4C

The death of one of history's most enigmatic rulers--Egypt's King Tutankhamun--remains shrouded in mystery 3300 years later. No one knows what ended the young pharaoh's life, but scientific advancements may be getting us closer to the answer.

Experts believed they knew what caused the Hindenburg disaster, 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.

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. What happened to the mummy of Alexander the Great?

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?