Shirahata Castle - Credit: Wikimedia Commons
is the remains of a Muromachi period Japanese castle structure located in the town of Kamigōri, Akō District, Hyōgo Prefecture, Japan. Its ruins have been protected as a National Historic Site as one of the Remains of Akamatsu-shi Castles, combining both Okishio Castle and Kanjōsan Castle, since 1996. Read more on Wikipedia
Source: en.wikipedia.org