Notorious for drugs and crimes, the Kowloon Walled City used to be the most dangerous place in the British Hong Kong. The lawless city was home to over 33,000 people squeezed into a tiny 6.5-acre lot, making the grimy slum over 100 times denser than present-day New York City.
Constructed in the 1950s, the interconnected web of towers was overrun and blighted by organized crime, including drug dealing, gambling and prostitution, along with poverty and poor health and sanitation services.
Since the settlement was essentially lawless due to a territorial dispute between China and British Hong Kong, the city was actually governed by drug cartels, including the Triads, in the later decades. In fact, the police feared to step foot into the area.
In 1980s, authorities decided to demolish the Kowloon Walled City and replace it with a park. Although they tore it all down in 1994, the city remains alive as a pop-culture phenomenon, particularly in China and Japan.
Find out more about the lost Chinese city in the video above.