As the name implies, a pass is a military defense system built in the Qin and Han periods. However, because of the age, it is difficult to see the pass of the past, and the specific location has not been fully verified. Now the local area is a village. If tourists visit archaeologically in the past, they can't see any scenery. Only by consulting the local residents can they hear some rumors. If you know the attractions, you can only check from the history books.