I came across a video on Youtube discussing it (there are several), and Kowloon Walled City is just endlessly fascinating. A few notable videos I found on the subject were:
Kowloon Walled City: Hong Kong’s City of Darkness
Inside Hong Kong’s Kowloon Walled City
There is also a book on the city called City Of Darkness Life In Kowloon Walled City, which I found on archive.org in high resolution. It is full of photographs and detailed accounts of the comings and goings within the enclave.
I most recently encountered this fact from the game, Stray! You know, the recent game with the cat and all the robots. Apparently their city design was heavily inspired by the Kowloon Walled City.
Absolutely love Stray. The world design was fantastic
Apparently it was inspired by Kowloon walled city!
Oh wow, TIL!