2017-04-2013 seasons140 episodes
Documentary series investigating why some of the world's most advanced architectural achievements were abandoned.
Seasons
Season 1
6 episodes
Season 2
8 episodes
Season 3
10 episodes
Season 4
9 episodes
Season 5
Season 6
11 episodes
Season 7
Season 8
Season 9
22 episodes
Season 10
16 episodes
Season 11
Season 12
Season 13
12 episodes