Adapted from Decoded, Meltzer's hit show on the History network, History Decoded explores many fascinating and unexplained questions.

Is Fort Knox empty? Why was Hitler so intent on capturing the Roman "Spear of Destiny"? What's the government hiding in Area 51? Where did the Confederacy's $19 million in gold and silver go at the end of the Civil War? And did Lee Harvey Oswald really act alone?

Meltzer sifts through the evidence; weighs competing theories; separates what we know to be true with what's still - and perhaps forever - unproven; and in the end, decodes the mysteries, arriving at the most likely solution. Along the way we meet Freemasons, Rosicrucians, Nazi propagandists, and the real DB Cooper.