Hanyangdoseong, also known as the Seoul City Wall, is a historic fortification that once surrounded the city of Seoul, South Korea. Built during the Joseon Dynasty in the late 14th century, it was designed to protect the capital from invasions. The wall stretches approximately 18.6 kilometers and features various gates, watchtowers, and scenic viewpoints. Today, parts of Hanyangdoseong have been preserved and are accessible to the public. Visitors can walk along the wall and enjoy panoramic views of the city. The site is recognized for its cultural significance and is a popular destination for both locals and tourists interested in Korean history.