gunkanshima

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Hashima Island, commonly called Gunkanjima or Gunkanshima (Battleship Island), is an uninhabited island in the Nagasaki Prefecture about 15 kilometers from Nagasaki itself. The island’s most notable features are the abandoned concrete buildings and the sea wall surrounding it.

Once one of the most population-dense locations in the world, Hashima Island was abandoned in 1974. Today it is empty and has been dubbed Ghost Island. It remains a beautiful example of urban decay and abandonment.

Wikipedia:

Hashima Island (端島?, or correctly Hashima, as -shima is Japanese for island), commonly called Gunkanjima or Gunkanshima (軍艦島; meaning Battleship Island), is one among 505 uninhabited islands in the Nagasaki Prefecture about 15 kilometers from Nagasakiitself.

The island was populated from 1887 to 1974 as a coal mining facility. The island’s most notable features are the abandoned concrete buildings and the sea wall surrounding it. It has been administered as part of Nagasaki city since 2005; it had previously been administered by the former town of Takashima.