The fortress-like Kowloon Walled City of Hong Kong was demolished in the early 1990s, but a German documentary crew braved the sprawl in 1989 and captured amazing footage from inside this sunlight-less patchwork metropolis.
https://gizmodo.com/the-walled-city-where-sunlight-couldnt-reach-5512888
Check out more footage from this astounding arcology here, here, and here.
[Spotted on Laughing Squid. Top photo via Doobybrain.]
