The Kowloon Walled City in Hong Kong was once the densest place on earth, a virtually lawless labyrinth of crime, grime, commerce and hope. A Wall Street Journal documentary tracks its colorful legacy and brings the place alive 20 years later. Originally a Chinese military fort, the Walled City became an enclave after the New Territories were leased to the UK by China in 1898. Its population increased dramatically following the Japanese occupation of Hong Kong during World War II. By 1990, the walled city contained 50,000 residents within its 2.6-hectare (6.4-acre) borders. From the 1950s to the 1970s, it was controlled by local triads and had high rates of prostitution, gambling and drug abuse. [More]