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#1 - Underground Apocalypse
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#2 - Vietnam
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#3 - A-Bomb Underground
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#4 - Viking Underground
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#5 - Hitler's Last Secret
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#6 - Maya Underground
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#7 - Mob Underground
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#8 - Prophecies From Below
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#9 - New York: Secret Societies
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#10 - Washington D.C.: Seat of Power
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#11 - Stalin's Secret Lair
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#12 - Katrina Underground
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#13 - Secret Soviet Bases
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The 20 BEST Episodes of Cities of the Underworld
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