Detailed Cross-section of the Kowloon Walled City

"The Kowloon Walled City in Hong Kong was once the most densely populated place on earth. And without a single architect or any oversight whatsoever, the ungoverned hive of interlinking buildings became a haven for drugs, crime and prostitution. This is perhaps why the surreal, M.C. Escher-like structure, where one couldn’t even begin to imagine what life was like, captured the interest of the Japanese."

"When it was demolished in 1993 the Japanese public tuned in to national television where it was being broadcast. But what most didn’t know was that, up until the previous evening, a group of Japanese researchers, which included architects, engineers and city planners, and led by historian and cultural anthropologist Hiroaki Kani, had entered the deserted city and had been documenting every nook and cranny up until the bulldozers arrived...Their findings were compiled into a book that was published 5 years later."

Source: http://www.spoon-tamago.com/2014/10/28/detailed-cross-section-of-the-kowloon-walled-city-created-by-japanese-researchers/