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Secrets of the Underground

Mystery of the Serpent Mound

Season 1 Episode 2
Rob Nelson explores mysterious tunnels beneath Denver's airport, capitol building, and downtown to investigate rumors of a secret organization that operates below. In Ohio, he tries to uncover the ancient secrets of a mound shaped like a serpent.
  • 43 min
  • TV-PG
  • Premiered 02/21/2017