SEASON: 1
EPISODE: 2 - Mystery of the Serpent Mound
SYNOPSIS
Rob Nelson investigates mysterious tunnels under Denver's airport. Plus, in Ohio he tries to uncover the secrets of a giant serpent-shaped mound.
SEASON: 1
EPISODE: 2 - Mystery of the Serpent Mound
Rob Nelson investigates mysterious tunnels under Denver's airport. Plus, in Ohio he tries to uncover the secrets of a giant serpent-shaped mound.
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