The Seoul City Wall (Korean: 서울 성곽) or Hanyang Doseong (한양도성) is a defensive wall first built by the King Taejo of Joseon dynasty to defend the downtown area of Joseon's capital city Hanseongbu [ko] (한성부).

However, even through this period of harsh modernization, much of the City Wall survives to the present day in the Jongno and Jung districts of Seoul, it is now preserved as Historic Sites of South Korea.

[6] The original walls, built in the late 14th century were constructed of medium-sized round stones held together by mud.

[7] A major restoration in 1704 by King Sukjong rebuilt sections of the wall using large, uniform stone slabs which mark the final and last unique characteristic of Hanyangdoseong.

Signals sent across the country from one mound to another, using smoke by day and fire at night, were received by the beacon at the top of Namsan and conveyed to the Royal Palace.

[7] Hanyangdoseong, completed in 30 years, was torn down in many parts due to city planning initiatives and the introduction of trams lines.