Seoul City Wall

The Seoul City Wall, also called Hanyang Doseong, is a fortress that King Taejo of the Joseon dynasty originally built to protect the capital’s downtown area. It became a South Korean Historic Site in 1963 and is now a popular attraction in central Seoul.

Construction started in 1395, and most of the wall, including its eight gates, was finished by 1396. The wall was reinforced throughout the Joseon period, with major work in the 14th, 15th, and 18th centuries. Early on, it served as an administrative boundary, separating the inner city (Seong-jung or Doseong-an) from the outer areas (Seongjeosimni). After invasions from Japan in the 1590s and the Qing Empire about 40 years later, the wall was rebuilt with stronger military features. During Japanese colonial rule, large parts of the wall and its gates were torn down to modernize Seoul—Seodaemun, the west gate, was notably demolished. Despite this, much of the wall survives in the Jongno and Jung districts, preserved as historic sites. It remains a tourist draw and still marks a cultural divide between the original city center and the rest of Seoul.

The earliest walls, from the late 1300s, used medium round stones held by mud. In the mid-1400s, under King Sejong the Great, a major renovation replaced earthen sections with rectangular stone. A later restoration in 1704 by King Sukjong used large, uniform stone slabs, giving the wall its final distinct look. The eastern section, on lower ground and more vulnerable, had a lookout added outside the gate, with a rectangular extension between Heunginjimun and Gwanghuimun for defense. Beacon mounds, part of the defense system, were set up in 1394 and used until 1894. Signals—smoke by day, fire by night—traveled from mound to mound across the country, ending at Namsan’s beacon, which relayed them to the palace. One lit beacon meant normal conditions; two signaled an enemy sighting; three, an enemy nearing the border; four, a border crossing; and five, a battle at the border.

Four main gates and four auxiliary gates were built in the late 1300s. The main gates were Dongdaemun (east), Seodaemun (west), Namdaemun (south), and Sukjeongmun (north). The auxiliary gates sat between them: Souimun (southwest), Changuimun (northwest), Hyehwamun (northeast), and Gwanghuimun (southeast). Today, Sungnyemun (south gate) is National Treasure No.