Hagi Kōgoishi
Asakura, Japan
Hagi Kōgoishi was an ancient castle (also known as a Korean-style fortresses in Japan (Chōsen-shiki yamajiro) located in the Hakihosaka and Hakihayashida neighborhoods of the city of Asakura, Fukuoka Prefecture Japan. Its ruins have been protected as a National Historic Site since 1972.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).