History's Greatest Mysteries

The world's most famous painting vanishes in a daring heist, sparking international outrage and a global manhunt; a master detective is called in, who zeroes in on a handful of suspects with the motive and means to pull off the theft; who stole the legendary Mona Lisa?

It's one of the most legendary monsters said to be lurking in the vast open seas. With stories going back hundreds of years, this elusive creature has terrorized sailors and baffled scientists. Is this predator the stuff of legend… or could the Kraken be real?

The notorious mafia kingpin Sam Giancana is shot execution style in his own home. The larger-than-life mobster had many enemies, from inside the mafia to the CIA. Was his death a crime of passion? The result of unpaid debts? Or part of an alleged government cover-up for a presidential assassination? Why was Sam Giancana killed, and who ordered the hit?