Introduction to the Hall of Prayer for Good Harvests: is the main building of the Altar of Prayer for Good Harvests and a temple where grain praying ceremonies were held during the Ming and Qing dynasties. The Hall of Prayer for Good Harvests is a wooden structure with a round spire and three layers of blue glazed tiles. On the upper eaves and lower south are hanging gold plaques with nine dragon flowers and gold inscriptions on the blue background, "Hall of Prayer for Good Harvests". The Hall of Prayer for Good Harvests is 31.60 meters high, with a total height of 5.20 meters on the three-story base and a total height of 36.80 meters. It is one of the tallest ancient buildings in Beijing.