Introduction to Wando Mountain Castle and Inland Castle: Wando Mountain Castle and Inland Castle are dependent on each other and serve as capitals for each other, forming a new model of attached royal capitals in the history of world royal capital architecture and writing a magnificent chapter in the history of ancient capitals in the world. . Both are included in the World Heritage List.
Wandosan Fortress was the military garrison of the domestic city. It was also used as the royal capital of Goguryeo and played an important role in the historical development of Goguryeo. There are 3 above-ground ruins, a cistern and 37 tombs in the city.
The domestic city is slightly square in shape with a direction of 155 degrees. The east wall is 514 meters long, the west wall is 699 meters long, the south wall is 749 meters long, and the north wall is 779 meters long. The circumference is 2741 meters. The inner and outer walls are all built with rectangular stones or square stone strips. The lower part is built in a ladder shape, and the horse faces are built layer by layer at certain distances. There are turrets at the four corners to improve defense capabilities. Now due to the passage of time, it has not regained its scale.