Secrets Underground

7:00 PM to 8:00 PM
Friday 4 October
+

Mystery of the Serpent Mound

Season 1 Episode 2 of 8

Rob Nelson investigates mysterious tunnels under Denver's airport, then heads to Ohio to uncover the secrets of a giant serpent-shaped mound

Secrets Underground airs on Discovery History +1 at 7:00 PM, Friday 4 October. (Subtitles.)
Topics