Season
- Season 2 2017-10-28
- Season 1 2017-02-14
Episode
- 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: American Stonehenge
Secrets of the Underground Season 1 Rocky Mountain Monsters
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.
