Kowloon Walled City
We just got to know about this fantastic web documentary about the Kowloon Walled City, in Hong Kong. This densely populated settlement in Hong Kong was demolished in 1993, and was originally a Chinese military fort (thus the name). The average apartment size was 29m2, and hosted in 1987 approximately 33000 inhabitants in a plot measuring about 210 by 120 metres. It used to be the most dense place on earth.
See Wikipedia article.
Here’s the link to the documentary: http://projects.wsj.com/kwc