Secrets of the Underground
Overview:
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.
Season 1
Episode 1:
Capone's Escape Tunnels
Episode 2:
Mystery of the Serpent Mound
Episode 3:
America's Buried Massacre
Episode 4:
Rocky Mountain Monsters
Episode 5:
Great Lakes Bermuda Triangle
Episode 6:
California's Hidden Doomsday
Episode 7:
Secret History of the New World
Episode 8:
