Introduction to Qingyun Ladder: Qingyun Ladder, formerly known as "Tiyunguan Pass", is located above the "Wanyuan Pavilion" and below the "Wenchang Palace". When the park was built in 1955, it was moved from the east to the center of the central axis. They walked down to Wanyuan Pavilion, and walked up to Wenchang Palace, which has the meaning of "the blue clouds go straight up".