Season 1
episodes
1.Fortresses
Aug 13, 202644m
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.
2.For the Gods
Aug 20, 202643m
Explore some of the world's remarkable engineering marvels.
3.Episode 3
Jul 15, 202645m
4.Episode 4
Jul 15, 202644m
5.Episode 5
Dec 9, 202543m
6.Episode 6
Dec 16, 202544m
7.Episode 7
Dec 23, 202544m
8.Episode 8
Dec 30, 202544m