#4: Close Quarters, King-Sized Building
This apartment building is appropriately called the “Monster Building” by many, but its name is unknown. Located in Hong Kong, its five total buildings are connected. It is genuinely humongous at 18 stories tall, with over 2,200 units.

It has over 50 floors within 18 stories, and it houses 10,000 people. The units are very high priced, ranging in the hundreds of thousands of dollars USD, and locals say it isn’t out of the norm to see living conditions like this. In fact, some claim that they only knew about it due to social media.