What really happened to union boss Jimmy Hoffa? Could modern technology finally prove the existence of the Holy Grail? And did inventor Rudolf Diesel really die at sea, or did he stage his own disappearance?

Was witchcraft at work during the Salem Witch Trials, or psychological illness? Did Britain's famous UFO sighting by military officials have a more earthly explanation? Who's really responsible for the murder of the "Mad Monk" of Russia?

Over 80 years ago, a mysterious body was found on a beach, accompanied by only a cryptic note. The Trojan War and the Trojan Horse may not be mythical after all. And new evidence may prove Shakespeare didn't author his own works.

Josh hunts down the world's most elusive treasures. What became of Konigsberg Castle's Amber Room, stolen by the Nazis? Could a lost hard drive in a British landfill hold millions in Bitcoin? Did King Solomon's legendary mines ever exist?

High on Everest's icy slopes, two climbers vanish into legend. In a quiet West Virginia town, a ghost demands justice from beyond the grave. And learn the real story of Mata Hari -- the exotic dancer condemned as a German spy.