Introduction to Shujiatang: Located in Huanghe Township, Fenghuang County, also known as Shujiatang, it was once the military camp of Yang Zaisi, the third son of Yang Liulang, a general of the Yang family in the Northern Song Dynasty, who stationed troops in Fenghuang. The planning of the ancient castle is very unique and reasonable. There are 13 large stone gates in the city, all of which are built from a single stone and are of extraordinary momentum.