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. As new evidence is unearthed, the mystery endures: what became of Blackbeard's lost treasure?

Awe-inspiring and mysterious, the pyramids of Egypt are among the most significant wonders of the ancient world. More than 4,000 years old, they are among the most celebrated architectural marvels in the world. But no one fully understands how they were built, or why. Can we ever decipher the true purpose of Egypt's astonishing pyramids?