Kowloon Walled City, located in Hong Kong, was once the most densely populated place on Earth, housing approximately 50,000 residents within 6.5 acres during the 1980s. It originated as a Song Dynasty outpost and evolved into a Qing fort, becoming a refuge for displaced individuals and informal industries due to the lack of government control. The Walled City featured a complex of makeshift high-rises, some reaching 14 stories, interconnected to allow traversal without going outside. It was dismantled in the mid-1990s and now exists only in memory and cultural references. A creator known as Sluda Builds has digitally reconstructed Kowloon Walled City in Minecraft, showcasing its skyline and intricate inner workings.