So I've recently read an article on decaying urban zones / shantytowns and came across this thing called Kowloon Walled City that used to be in Hong Kong
http://www.dailymail.co.uk/news/article-2139914/A-rare-insight-Kowloon-Walled-City.html
http://en.wikipedia.org/wiki/Kowloon_Walled_City
It looked like something right out of Hell, a very weird social anomaly if I ever saw one. Thought I'd share.