

Overview
Documentary series investigating why some of the world's most advanced architectural achievements were abandoned.
Seasons

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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