Season 1, Episode 2

Mystery of the Serpent Mound

Rob Nelson explores mysterious tunnels beneath Denver's airport, capitol building, and downtown to investigate rumors of a secret organization. Also, the ancient secrets of a giant mound shaped like a serpent are investigated.
See Tune-In Times

Previous Episode

American Stonehenge

Next Episode

Capone's Escape Tunnels


Baggage Battles

7:30am | 6:30c
8:30am | 7:30c
9am | 8c
9:30am | 8:30c
10am | 9c
10:30am | 9:30c
11am | 10c
11:30am | 10:30c
On Tonight
On Tonight

Ghost Adventures

8pm | 7c

The Dead Files

11pm | 10c

Stream discovery+

Your favorite shows, personalities and exclusive originals. All in one place.

Subscribe Now

What's New in Shows

Follow Us Everywhere

Join the party! Don't miss Travel Channel in your favorite social media feeds.