Mungyeongsaejae Pass, which crosses Joryeongsan Mountain, has always been the highest and most dangerous mountain pass in Korea, being reputed to be too tall for even birds to fly over. The three gates of Juheulgwan, Jogokgwan, and Joryeonggwan were built for national defense after the Imjin War (1592-1598). These three gates are designated collectively as Historic Site No. 147. The area between the three gates was designated a provincial park in 1981. The path from the first gate to the last passes through beautiful forests and takes roughly four hours round-trip. Also located within the park boundaries is Mungyeongsaejae Open Set, used for filming historical dramas.