Noshima Castle - Credit: Wikimedia Commons
was a Sengoku period Japanese castle in Ehime Prefecture, Japan, located on an island in the Seto Inland Sea. It was the stronghold of the Noshima Murakami, a maritime clan of sailors and sometimes pirates or mercenaries. The ruins of Noshima Castle were designated as a National Historic Sitein 1953. Read more on Wikipedia
Source: en.wikipedia.org