Introduction to Beiguanbao: Beiguanbao Village is the largest of the "Three Forts" in Nuanquan Ancient Town. It was built in the early Ming Dynasty. The tall and well-preserved mountain-style fort gatehouse shows its richness. military atmosphere. The Lu family's small fort inside the fort is the first place where people live in Nuanquan. It and Beiguan Fort form a major feature of Yuzhou Castle, the "Fort". After winter, Beiguan Fort becomes even more vicissitudes of life.