Secrets of the Underground — Season 1, Episode 8: American Stonehenge
Reality, Documentary • 60 min • 2 seasons, 16 episodes • ★ 5.5/10
Episode synopsis
Rob Nelson investigates the mysterious pattern of rocks at the bottom of Lake Michigan known as Underwater Stonehenge. At the notorious Alcatraz prison, Rob uses state-of-the-art technology in search of rumored escape tunnels.
About Secrets of the Underground
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.