Season
- Season 4 2021-09-07
- Season 3 2008-10-26
- Season 2 2008-01-28
- Season 1 2007-03-02
- Season 0 2006-03-02
Episode
- Episode 1: Underground Apocalypse
- Episode 2: Vietnam
- Episode 3: A-Bomb Underground
- Episode 4: Viking Underground
- Episode 5: Hitler's Last Secret
- Episode 6: Maya Underground
- Episode 7: Mob Underground
- Episode 8: Prophecies From Below
- Episode 9: New York: Secret Societies
- Episode 10: Washington D.C.: Seat of Power
- Episode 11: Stalin's Secret Lair
- Episode 12: Katrina Underground
- Episode 13: Secret Soviet Bases
Cities of the Underworld Season 2
8.2/10 users Don Wildman travels to the farthest and deepest reaches of the globe, using cutting-edge technology to explore mysteries buried deep underground.
