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S1 · E4
44m
1. Fortresses
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.
43m
2. For the Gods
Explore some of the world's remarkable engineering marvels.
45m
3. Episode 3
No description available.
44mPlaying
4. Episode 4
No description available.
43m
5. Episode 5
No description available.
44m
6. Episode 6
No description available.
44m
7. Episode 7
No description available.
44m
8. Episode 8
No description available.
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