Cities of the Underworld

Episode 1 2007-03-02 - Istanbul
Episode 2 2007-04-23 - Scotland's Sin City
Episode 3 2007-04-30 - Hitler's Underground Lair
Episode 4 2007-05-07 - Rome's Hidden Empire
Episode 5 2007-05-14 - Catacombs of Death
Episode 6 2007-05-21 - City of Caves
Episode 7 2007-06-04 - New York
Episode 8 2007-06-11 - London's Lost Cities
Episode 9 2007-06-18 - Beneath Vesuvius
Episode 10 2007-06-25 - Freemason Underground
Episode 11 2007-07-09 - Dracula's Underground
Episode 12 2007-07-16 - Secret Pagan Underground
Episode 13 2007-07-23 - Underground Bootleggers
Episode 14 2007-07-30 - Rome: The Rise

Episode 1 2008-01-28 - Underground Apocalypse
Episode 2 2008-02-04 - Vietnam
Episode 3 2008-02-11 - ABomb Underground
Episode 4 2008-02-25 - Viking Underground
Episode 5 2008-03-03 - Hitler's Last Secret
Episode 6 2008-03-10 - Maya Underground
Episode 7 2008-03-17 - Mob Underground
Episode 8 2008-03-24 - Prophecies From Below
Episode 9 2008-03-31 - New York: Secret Societies
Episode 10 2008-04-14 - Washington D.C.: Seat of Power
Episode 11 2008-04-21 - Stalin's Secret Lair
Episode 12 2008-04-28 - Katrina Underground
Episode 13 2008-05-05 - Secret Soviet Bases

Episode 1 2008-10-26 - City Of Blood
Episode 2 2008-11-02 - Tunnels Of Hell
Episode 3 2008-11-09 - Real Mafia Underground
Episode 4 2008-11-16 - Secret Sin City
Episode 5 2008-11-23 - Hitler's Trenches
Episode 6 2008-12-01 - Barbarians' Lair
Episode 7 2008-12-08 - Land of Manson
Episode 8 2008-12-15 - Gladiators: Blood Sport
Episode 9 2008-12-22 - Secret Holy Land
Episode 10 2009-01-12 - Under the Rock
Episode 11 2009-01-26 - Tomb of the Lost Mummies
Episode 12 2009-02-02 - Gods of War
Episode 13 2009-02-09 - Alcatraz Down Under

Episode 1 2021-09-07 - Mayan Apocalypse
Episode 2 2021-09-14 - America's Military Underground
Episode 3 2021-09-21 - America's Unmapped Murder Tunnels
Episode 4 2021-09-28 - America's Ancient Ancestors
Episode 5 2021-10-05 - The Pirate Queen's Lair
Episode 6 2021-10-12 - Templars and The Founding Fathers
Episode 7 2021-10-19 - Secrets of the Ancient Metropolis
Episode 8 2021-10-26 - The Lost Aztec Colony