Taesongsan Fort, built between the 3rd century to the 5th in the period of Koguryo, is located in Taesong-dong, Taesong District, Pyongyang.

   As the largest among hundreds of mountain forts in Koguryo, it was 7 076 metres round and 9 284 metres long in total, including the reinforced walls.

   In 427, Koguryo moved its capital to the area of Anhak Palace in Pyongyang. At that time, the fort served as a base for defending the capital.

   As it was situated between two wide and deep valleys, it was favourable for many persons to stay there and to keep a lot of combat equipment and other materials. At present, there are the site of a temporary royal palace used in case of emergency and other sites of barracks, granaries, arsenals, depots and ponds.

   The fort was built with natural stones collected in and around Mt Taesong, which were cut in the shape of a square cone with a certain size.

   There are sites of 20 large and small gates. Nam Gate was rebuilt in 1978. 

   In those days the fort had abundant sources of water as there were 170 ponds. Water is still found in Ingo, Sasum, Kuryong, Jangsu and other ponds. According to a legend, thanks to the wonder done by the nine dragons in the 99 ponds in the fort, the ponds never dried out even in the long spell of drought.

   Taesongsan Fort is a precious cultural heritage showing the time-honoured history and outstanding culture of Pyongyang.