Natalee Ann Holloway; Nicola Tesla's greatest invention promised to power the world for free; the first discoverers of America; John Wilkes Booth.

The Jersey Devil; the battle of Little Big Horn; the murder of Bugsy Siegel; the man who fired the shot heard round the world; the Philadelphia Experiment; the 1920 Wall Street bombing.

A countdown of America's biggest mysteries continues with the story of the death of the first man of magic Harry Houdini, one of the old West's most prolific gunslingers, and the great moon hoax.

The murder of Thelma Todd; Babe Ruth fixing a match; Bigfoot's existence; Fatty Arbuckle suspected of killing Virginia Rappe; a bizarre Roswell connection; the Boston Heist Paintings; the mysterious death of Edgar Allan Poe.

Counting down America's greatest unsolved mysteries including the infamous escape from Alcatraz, the hunt for the New Orleans axeman, and Butch Cassidy and the Sundance Kid.

The execution of the Rosenbergs; the culprits of the St. Valentine's Day Massacre; the Phoenix Lights; Sirhan Sirhan was rumoured as a mob assassin; Pearl Harbor may not have been a surprise attack; the body buried in Billy the Kid's grave.