The abandoned Gunkanjima sits about 9 miles away from Nagasaki. It functioned as a coal mining facility from 1887 to 1974, a former symbol of Japan’s rapid industrialization. Mitsubishi bought the island in 1890 and began to extract coal from undersea mines. Japan’s first large concrete 9-storey building and a block of apartments were built in the island to accomodate the workers. However, Hashima mines were closed in 1974 when petroleum replaced coal in Japan.