Hongmenbao is a complex of Wangjia Courtyard, built in Qianlong (1739~1793). It is a castle, and it is like a city, built on the mountain. From low to high, the four-story courtyard is arranged, with symmetrical left and right, and a main road in the middle, forming a very regular "king" shape. At the same time, the shape of "long" is implied. The 88 courtyards in the castle have their own characteristics, none of them are the same.