These ancient toms are old mounds of the era of Goguryeo Kingdom that became known to academic circles in 1981. When the tombs were discovered, there were already signs of illegal mining. These two stone tombs prove that our province belonged to the territories of Goguryeo Kingdom in the age of Three Kingdoms.

As a result of excavation in 1993, we could find out how they were built, and the inside structure of the tombs. But, no relics were discovered at the time. Each of the two mounds has a 'Neolgil' (inside passage) in the eastern part, and consists of one room. The tombs at the western side was covered with soil just on the stone room, while the one at the opposite direction was first enclosed with stones that were piled up almost in the shape of a square and then covered with soil. That is the only difference between the two.

Both tombs were built in a unique style. The room is formed by filling up many small natural stones and then covering four flat stones over small stones to get rid of their edges and covering four stones on them again in the same way. And as a final step, one cover stone is put on the top hole. This style was introduced by Goguryeo from China, and was not found in the relics of Silla Kingdom or Baekje Kingdom.

Therefore, in light of the construction style applied to these tombs, we can find out that these ancient mounds were built during the era of Goguryeo Kingdom. Goguryeo had occupied this region since the reign of the King Jangsu (413-491), and around the middle of the 6th century, the region was taken by the King Jinheung of Silla Kingdom. In view of the historic assumption based on these findouts, it is likely that they were built during those period.

The tomb at the western area was re-covered with soil after excavation, whereas the one at the other direction is open for public tour after setting up a protection device.