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2017TV-PG13 seasonsStill airing
US availability from JustWatch
Documentary series investigating why some of the world's most advanced architectural achievements were abandoned.
US availability from JustWatch
Season 1
6 episodes · 2017
Season 2
8 episodes · 2018
Season 3
10 episodes · 2018
Season 4
9 episodes · 2019
Season 5
8 episodes · 2019
Season 6
11 episodes · 2020
Season 7
11 episodes · 2020
Season 8
11 episodes · 2021
Season 9
22 episodes · 2022
Season 10
16 episodes · 2023
Season 11
8 episodes · 2024
Season 12
8 episodes · 2025
Season 13
12 episodes · 2026
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