This fortress island has been abandoned since 1974. Designated as UNESCO World Heritage in 2015, the site is now protected and only a tiny, uninteresting section is accessible to visitors. The rest of the island is totally out of bounds. I’ve had the chance to visit its most secret spots five times. These adventures are described on my Offbeat Japan website: Gunkanjima: Photos & Stories.
An abandoned island off the coast of Japan and the most beguiling exploration.