The Seoul City Wall was originally built in 1396, surrounding Seoul (then known as  Hanyang) during the Joseon Dynasty (1392-1897). The wall stretches for 18.6km along the ranges of Bugaksan Mountain, Naksan Mountain, Namsan Mountain, and Inwangsan Mountain. The wall stands at average heights of 7m to 8m high. 

Along the Seoul City Wall, there once stood eight gates that were originally built between 1396-1398, but only six remain standing. The North, South, East, and West gates of the wall are known as the "Four Great Gates" (Sukjeongmun, Heunginjimun, Sungnyemun, Dongeuimun), while the Northwest, Northeast, Southwest, and Southwest gates are known as the "Four Minor Gates" (Changuimun, Hyehwamun, Gwanghuimun, Soeuimun).