Cities of the Underworld

Season 2, Episode 4: Viking Underground

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Dublin, Ireland is much more than a city full of pubs and pints. Pagan burial tombs, subterranean defense tunnels, and mysterious burial crypts line the underground below the rolling hills. Even an underground river runs through the heart of the city where you'd least expect to find it.

All Episodes - Season 2

Underground Apocalypse
Episode 1
Underground Apocalypse
 Vietnam
Episode 2
Vietnam
 A-Bomb Underground
Episode 3
A-Bomb Underground
 Viking Underground
Episode 4
Viking Underground
 Hitler's Last Secret
Episode 5
Hitler's Last Secret
 Maya Underground
Episode 6
Maya Underground
 Mob Underground
Episode 7
Mob Underground
 Prophecies From Below
Episode 8
Prophecies From Below
 New York: Secret Societies
Episode 9
New York: Secret Societies
 Washington D.C.: Seat of Power
Episode 10
Washington D.C.: Seat of Power
 Stalin's Secret Lair
Episode 11
Stalin's Secret Lair
 Katrina Underground
Episode 12
Katrina Underground
 Secret Soviet Bases
Episode 13
Secret Soviet Bases
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