History Unsolved: The Investigation Files

Find out how an entire colony, a priceless diamond and a Navy ship vanished.

Probe the mysterious fates of Edgar Allan Poe, Shakespeare and the "Mona Lisa."

Look at the puzzling deaths of a tycoon, three lighthouse keepers and nine Soviet hikers.

Reopen cases of vanished princes, stolen crown jewels and a death at court.

Track a Nazi-looted treasure, a bandleader's lost plane and Anne Frank's betrayer.

Rethink Napoleon's cause of death and then ID bones found under a patriot's home.

Join the manhunt for Alcatraz escapees, a pirate and a New Orleans killer.

Revisit the crimes of Jack the Ripper and two other notorious serial killers.

Peek inside the lives of Mata Hari, Kaspar Hauser and the Man in the Iron Mask.

Dive into the mystery of the HMS Terror and board the ghost ship Mary Celeste.