If a metropolis were as densely inhabited as Kowloon Walled metropolis in Hong Kong, it would be possible to cram the entire human population of the Earth inside of a city that was the size of Palestine. Kowloon Walled City was a town in Kowloon, Hong Kong, that had a high population density but was not administered by any authority. In the early 1990s, the city's population reached its highest point of 1.
2 million inhabitants, making it one of the most densely populated areas in the world at the time. Although the city was leveled in 1993, the legacy it left behind continues to have an impact on urban planning and architecture.