The Kowloon Walled City was a 2.6 hectare enclave within British Hong Kong that was always legally an exclave of China, in all its iterations. However, because there was never any Chinese central government willing or capable of governing it, it was de facto a legal vacuum, where in practice the Triads held sway. It had the highest population density of anywhere in the world. In the final years of British rule, China agreed to permit the UK to demolish it and build a new park.
What are other examples of tiny enclaves that, due to historical and legal quirk, become a legal vacuum?
What are other examples of tiny enclaves that, due to historical and legal quirk, become a legal vacuum?