Chŏnma and Songgo, the castle was first founded as a fortress for the defense of the capital, encircled by over 10 kilometers of stone walls.
The fortress contains two small Buddhist temples, Kwanumsa and Taehungsa.
Named after Guanyin, the buddhist bodhisattva of compassion, this small temple is located in the beautiful valley between Mts.
Higher up on the mountain sits Taehŭng Temple, now much diminished from its Koryo-dynasty splendor.
The building that exists today is only the temple school, famed as the place where the son of King Taejo, founder of Koryo, studied around 921.