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Cities of the Underworld: 4x2
America's Military Underground
Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities… right under our feet.
4 - 1Mayan Apocalypse Sep. 07, 2021
4 - 2America's Military Underground Sep. 14, 2021
4 - 3America's Unmapped Murder Tunnels Sep. 21, 2021
4 - 4America's Ancient Ancestors Sep. 28, 2021
4 - 5The Pirate Queen's Lair Oct. 05, 2021
4 - 6Templars and The Founding Fathers Oct. 12, 2021
4 - 7Secrets of the Ancient Metropolis Oct. 19, 2021