Sosan Walls, believed to be built in the period of Koguryo Kingdom (B.C. 277-A.D. 668), was recently discovered by teachers and researchers of the History Faculty of Kim Il Sung University in the DPRK. According to Sinjungdonggukyojisungnam (Revised Handbook of Korean Geography) released in the 16th century and other historical books, the walls had been […]
