This enormous park was built in the early 15th century, around the same time the Forbidden City was constructed. The park hosts several intriguing buildings. In the north of the park, a stone carved stairway leads up to the entrance of the Hall of Prayer for Good Harvests with its cylindrical blue-tiled roof and a beautifully decorated ceiling. It was struck by lightning and burnt to the ground in 1889 but was carefully reconstructed the following year. The Hall of Abstinence was used by emperors for fasting. In the south, you will find the Round Altar—a three-tiered marble platform.