The fortress is massive: Concentric walls 11 meters high and 733 meters in diameter enclose an area of 33,500 square meters. The walls, turreted at each corner, connect to the Great Wall and the northern and southern sides.
The fortress is massive: Concentric walls 11 meters high and 733 meters in diameter enclose an area of 33,500 square meters. The walls, turreted at each corner, connect to the Great Wall and the northern and southern sides.