Formerly located in the territory of Hong Kong was arguably the most densely populated place on Earth. In fact, it might have been the most densely populated place in human history.

Not only was it packed with people, but it also had a unique political status. No government controlled it, which made it lawless, which in turn made it a magnet for organized crime.

Learn more about the Walled City of Kowloon, one of the most dangerous and densely populated places in history, on this episode of Everything Everywhere Daily.