Introduction to Tai Sui Hall: The building complex is located on the southwest side of the north gate of the inner altar of Xiannong Altar. It is a place for worshiping Tai Sui and the gods of nature such as spring, summer, autumn and winter. It is the most majestic group of buildings in Xiannong Altar. The main hall faces south from the north and is seven rooms wide. It has black glazed tiles with green edges, a resting top, and colorful seal paintings. There are three steps in front of the hall. The east and west verandas of Taisui Hall are eleven rooms wide each. To the south is the Worship Hall, also seven rooms wide, opposite the Taisui Hall. The exhibitions of the Beijing Ancient Architecture Museum are mainly concentrated in this group of buildings.