Najueupseong Walled Town was built in the Goryeo era, expanded in the 3rd year of the reign of King Sejo at the beginning of the Joseon Dynasty, and repaired on a large scale after the Japanese Invasion of Korea in 1592. According to a report of the fortress, it was made by pilling rocks, and it had circumference of about 940m and height of 2.7m. It is said to have had 3 Poru (hole to hold up cannon) on the wall of the fortress and 20 wells. There were four fortress gates, one each in the east, west, south, and north; at present, however, all of them are gone, and only the base stone at the north gate site remain. Namgomun Gate was restored at the site of the south gate in 1993; the two-storied small pavilion has 3 front boards and 2 side boards. Its showy roof shows part of the old appearance of Najueupseong. Only a few stone axes of the site of the south gate are left, but these important ruins should be preserved for their historical significance.