Namhansanseong

Namhansanseong is a historical mountain fortress city 25 km southeast of Seoul, South Korea. It sits approximately 480 m above sea level and is aligned with the ridges of the mountain for maximum defensibility. The fortress, stretching 12 km in length, protects a vast area used as an emergency capital city during the Joseon Dynasty of Korea. The design is based on fortress architecture of East Asia, embodying aspects of four historical cultural styles: the Joseon of Korea, the Azuchi-Momoyama Period of Japan, and Ming and Qing China.