Introduction to Monkey Mountain: Located on the southeast side of Beijing Zoo, it is the oldest existing building in the zoo and the only existing building built before 1949. Monkey Mountain covers an area of ​​1,000 square meters and is a sunken structure. In the center of the venue, rocks are piled up to form two rockeries, with ladders, tires and other recreational facilities suspended between them. In 2007, Monkey Mountain was closed due to the construction of a viaduct road. Now it is protected and displayed as the old site of Monkey Mountain. The new Monkey Mountain has been completed and opened.