Overview
Explore a massive defensive wall surrounding a historic Colombian city and see how a series of eerie metal structures protected the English coast during WW II; then visit a vast underground refuge in Turkey designed to protect tens of thousands.
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1 - 1Fortresses August 13, 2026 -
1 - 2For the Gods August 20, 2026 -
1 - 3Episode 3 July 15, 2026 -
1 - 4Episode 4 July 15, 2026 -
1 - 5Episode 5 December 09, 2025 -
1 - 6Episode 6 December 16, 2025 -
1 - 7Episode 7 December 23, 2025 -
1 - 8Episode 8 December 30, 2025