The monument, which is located within Jeokseong fortress in Mt. Seongjae, was presumably erected between the 6th and 11th years of King Jinheung (A.D. 545-550) during the reign of the Silla Kingdom, which occupied Jeokseong, a territory of the Goguryeo Kingdom, and then constructed to soothe their popular sentiments. It was discovered in 1978, with the lower part hidden 30cm deep in the earth. The surface was found to be relatively well-preserved, with the letters inscribed legibly. The structure of a free shape, perhaps made of natural stone, is wide and thick in the upper part, but narrow and thin in the lower part. The top part was cut off, with the sides left intact. About 440 letters are assumed to have been inscribed, but now there are only 288 legible letters remaining in orderly rows and columns. They show dynamic features in the transition period of technique of calligraphy, and are referred to as research material.
The inscription reads that any person who contributed to the country’s territorial expansion and is loyal to his country should be awarded alike.
The historic relic enables us to gain new knowledge of legal and administrative systems and penalties applied during the reign of Silla, including the forced labor system, national laws on distribution of properties and legitimate generalization of local customs.
The symbolic heritage, which was established in a strategic point set for attacking northern regions, represents the national willingness to absorb Goguryeo residents who were inevitably forced to obey. The monument is considered highly valuable in that it was set up in honor of glorious territorial expansion, although it does not commemorate King Jinheung’s inspection tours.
The tower is situated about 11km northeast of Gosu Grand Bridge at Danyang-eup. In the past, fields surrounded the structure, but now rural houses have replaced it. It can probably be inferred that the stupa, around which pieces of porcelains and roofing tiles remain scattered, was set up within the precinct. However, any traces of a temple site cannot be seen. In 1935, the tower, in which sariras had been kept, was broken down when the relics were stolen and later rebuilt by the local community.
The tower comprises a three-storied tower body on a two-layered stylobate. The base is founded on several stones that are long and big, with pieces of a column shape inserted on each corner and in the middle of each layer. The parts of the tower body consist of body stones and roof stones, with pieces of a column shape placed on each corner of body stones. The top part has several ornaments in the shapes of an upside-down bowl, sprouted lotus flower and lotus bud.
Characteristically, the pagoda has a good shape in good proportion to parts, based on the style of constructing stone towers that were built up during the reign of the Unified Silla Kingdom. This beautiful stonework epitomizes one of proportionate models.
Ondalsanseong, historic site No. 246, is a mountain fortress wall that was established around the South Han River. The semicircular stoned bastion, 972m long and 3m high, has been well preserved.
During the Three Kingdoms era, the bulwark was the field in which Goguryeo and Silla kingdoms engaged in intense battles, in order to dominate the south Han River. A famous love story between General Ondal, son-in-law of a Goguryreo King, and Princess Pyeonggang has been handed down through history. Relics were excavated inside the site, with much of the well left still undamaged, and a trapezoid shaped drain outlet remains outside of it. Also remarkable are the forms of gates in the south and the west, and the protruding part of the east gate, all of which can hardly be seen in any of Korea’s other old citadels. Northeast of the castle, there is a lime cave called Ondalgul below the precipice along the South Han River. The stoned wall, which remains well preserved, is considered one of the important relics for studying how to build up a citadel. A sightseeing resort, adjacent to Ondal Cave, has been opened in the vicinity of the castle.