Walled Cities - Kowloon... New Parks - Kowloon (cf London's Olympic Park)

From 1b Blogspot

 35 thousand population, 0.03 km2 area of the quarter

1915 map"Chinese Town" = Kowloon

The walls were demolished by the Japanese during WW2. It was disputed sovereignty with Chinese Communist claiming a right to rule but unable to exercises it and a UK-colonial Hong kong Gov't reluctantly intervening, only when it felt compelled to. Flooded by squatters and migrants and without state control it became amongst the most densely settled in the world. A thorough government survey in 1987 gave a clearer picture: an estimated 33,000 people resided within the Walled City. Based on this survey, the Walled City had a population density of approximately 1,255,000 inhabitants per square kilometre in 1987.

https://ssl.panoramio.com/photo/278735

Now it's a park...

By Baycrest (Own work) [CC-BY-SA-2.5 (http://creativecommons.org/licenses/by-sa/2.5)], via Wikimedia Commons

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Part of an elite crop of new parks, which will include London's own Olympic Park