| 1x01 | Apr. 23, 2007 | Scotland's Sin City | | 1x02 | Apr. 30, 2007 | Hitler's Underground Lair | | 1x03 | May. 07, 2007 | Rome's Hidden Empire | | 1x04 | May. 14, 2007 | Catacombs of Death: Paris | | 1x05 | May. 21, 2007 | City of Caves: Budapest | | 1x06 | Jun. 04, 2007 | New York: The Big Apple | | 1x07 | Jun. 11, 2007 | London's Lost Cities: London | | 1x08 | Jun. 18, 2007 | Beneath Vesuvius: Naples | | 1x09 | Jun. 25, 2007 | Freemason Underground: Boston and Philadelphia | | 1x10 | Jul. 09, 2007 | Dracula's Underground: Bucharest | | 1x11 | Jul. 16, 2007 | Secret Pagan Underground: Cappadocia, Turkey | | 1x12 | Jul. 23, 2007 | Underground Bootleggers: Portland, Oregon | | 1x13 | Jul. 30, 2007 | Rome: The Rise | | 1 | Mar. 02, 2006 | Istanbul |
| 2x01 | Jan. 28, 2008 | Underground Apocalypse | | 2x02 | Feb. 04, 2008 | A-Bomb Underground | | 2x02 | Mar. 31, 2008 | New York: Secret Societies | | 2x03 | Feb. 11, 2008 | Vietnam | | 2x04 | Feb. 25, 2008 | Viking Underground | | 2x05 | Mar. 03, 2008 | Hitler's Last Secret | | 2x06 | Mar. 10, 2008 | Maya Underworld | | 2x07 | Mar. 17, 2008 | Mob Underground | | 2x08 | Mar. 24, 2008 | Prophecies From Below | | 2x09 | Apr. 14, 2008 | Washington D.C.: Seat of Power | | 2x10 | Apr. 21, 2008 | Stalin's Secret Lair | | 2x11 | Apr. 28, 2008 | Katrina Underground | | 2x12 | May. 05, 2008 | Secret Soviet Bases |
| 3x01 | Oct. 26, 2008 | City Of Blood | | 3x02 | Nov. 02, 2008 | Tunnels Of Hell | | 3x03 | Nov. 09, 2008 | Real Mafia Underground | | 3x04 | Nov. 16, 2008 | Secret Sin City | | 3x05 | Nov. 23, 2008 | Hitler's Trenches | | 3x06 | Dec. 01, 2008 | Barbarians' Lair | | 3x07 | Dec. 08, 2008 | Land of Manson | | 3x08 | Dec. 15, 2008 | Gladiators: Blood Sport | | 3x09 | Dec. 22, 2008 | Secret Holy Land | | 3x10 | Jan. 12, 2009 | Under the Rock | | 3x11 | Jan. 26, 2009 | Tomb of the Lost Mummies | | 3x12 | Feb. 02, 2009 | Gods of War | | 3x13 | Feb. 09, 2009 | Alcatraz Down Under |
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