Boeun Samnyeonsanseong Fortress
104 Seongju 1-gil, Boeun-eup, Boeun-gun, Chungcheongbuk-do
Samnyeonsanseong Fortress in Boeun, North Chungcheong Province, is an impregnable Silla-era mountain fortress with a 1.7km perimeter and walls 13-20 meters high. Its name means either that the fortre…