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• S4.E1 ∙ Mayan Apocalypse
• S4.E2 ∙ America's Military Underground
• S4.E3 ∙ America's Unmapped Murder Tunnels
• S4.E4 ∙ America's Ancient Ancestors
• S4.E5 ∙ The Pirate Queen's Lair
• S4.E6 ∙ Templars and the Founding Fathers
• S4.E7 ∙ Secrets of the Ancient Metropolis
• S4.E8 ∙ The Lost Aztec Colony