Between the mountains of Achasan
The area around Mount Achas is a ruin of the Three Kingdoms period found in Mount Achas, more than half of which is presumed to be the remains of Goguryeo. Mt. Achasan 1, 2, 3, 4, 5, 6 Borou, Yongmasan 1, 2, 3, 4, 5, 6, 7 Boroung, Hongleng Bon 1 and 2 Borou, Sirubong Boru, . On Oct. 5, 2002, it was designated as the 21st monument of the Seoul Metropolitan Government of the Republic of Korea. On October 27, 2004, the Seoul Metropolitan Monument was designated as the same day as the 455th National Archaeological Site,