Kowloon Wall City (KWC) was once the most densely populated place on earth.
At the beginning, KWC was a garrison used by the Chinese government. Once Hong Kong became a British colony the Chinese officials and military left KWC which then became abandoned by the authorities.
It quickly became inhabited by criminals and people avoiding the law.
Since it was a lawless place, people continued building above the buildings in any way possible. Soon all the residential buildings were extremely close to each other and interlinked. There was no road and no sunlight between the different towers. It had become one massive building.
The city housed anybody from triad members, prostitutes, immigrants, children, illegal dentists…It was also home to many tiny food factories who supplied some of the finest restaurants in Hong Kong.
There was no proper sewage or water system and no sunlight.
People gathered on the roof tops to play, exercise and breathe some fresh air.
When the Kai Tak airport was still open, the planes flew very very close to the rooftops of KWC, some passengers say they even saw the TV screens flickering inside some apartments.
This giant squatter camp was a problem and embarrassing to the British, so it was demolished in 1993 and is now a cute memorial park….but the special atmosphere still lingers.
If you have time, take a look at this website and this documentary because Kowloon Walled City was mind blowing.