Chongbang Fortress — Wikipedia

Jŏngbang Castle (Korean: 정방산성) is a Koguryo-era mountain fortress located outside Sariwŏn, North Hwanghae Province, North Korea. Cresting the ridges of Mt. Jŏngbang, the fortress was built for the defence of the Koguryo capital of Pyongyang. Rebuilt in 1632 by Kim Chajŏm, the fortress skillfully uses the surrounding cliffs by cutting down the outer slope and winding around the cliffs and ridges, to give a fortress surrounded by over 12 kilometres of 6-metre high stone walls, which extend to over ten metres tall in some places. The walls are pierced by four large gates, the most well...