Introduction to the small and medium-sized forts: The small and medium-sized forts were built in the Ming Dynasty. There are 18 large-scale ancient residences in existence. It is the smallest of the three forts in Nuanquan Town. The environment inside the fort is elegant and closely related to Fengyuan Pool. The spring is lined with century-old willows on both sides, and it has the reputation of being like a small bridge in the south of the Yangtze River.