Kowloon Walled City

The closest we ever came to evolving something out of Calvino's Invisible Cities, in my opinion.

Easy to romanticize something that was, in a way, a crime infested slum. But it's a shame it's no longer there to be experienced.

"The Densest City on Earth" -- tells the story with pretty visuals https://youtu.be/4YuNvIfM-YA