Kowloon walled city in 1989. Image © <a href='https://commons.wikimedia.org/wiki/File:Aerial_view_of_Kowloon_Walled_City_in_Hong_Kong_on_1989-03-27.jpg'>Wikimedia user Jidanni</a> licensed under <a href='https://creativecommons.org/licenses/by-sa/3.0/deed.en'>CC BY-SA 3.0</a>
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