Hashima Island (for its historical coal mining relevance)

Hashima Island, also known as Battleship Island, is a small, densely populated island in Japan that was a major center for coal mining from the late 19th century to the mid-20th century. It housed thousands of workers in underground mines and apartment complexes, which were built to support the mining operations. The island's infrastructure and buildings reflect Japan’s rapid industrial growth during that period. After coal demand declined, mining ceased in 1974, leading to abandonment. Today, Hashima preserves its industrial heritage as a UNESCO World Heritage Site, illustrating the history of Japan’s early modernization and industrialization efforts.