Found this photo and caption on a random website. Stopping to think about it, it’s just astonishing.
Before it was demolished in 1993, this area of Hong Kong was the densest urban slum in the world. Nearly 50,000 people lived on 6.5 acres. More than 7,000 people per acre.The buildings grew so tall that sunlight couldn’t reach the bottom levels and most residents never saw daylight. It was a place where brothels, casinos, opium dens, cocaine parlors, food courts serving dog meat and secret factories ran unmolested by authorities.