Tsuwano Castle

Tsuwano Castle was a Japanese castle located in what is now the city of Tsuwano, Shimane Prefecture, in the San'in region of far western Japan. Its ruins have been protected by the central government as a National Historic Site since 1942. In its early history, it was called Sanbonmatsu Castle or Ipponmatsu Castle. During the Edo Period, it was the center of Tsuwano Domain ruled by the Kamei clan; however, the administrative offices and daimyō residence were located at the base of the mountain to avoid the steep mountain paths.

Source: Wikipedia