Introduction to the antique city wall: The antique city wall is 1,200 meters long, with a maximum height of 16 meters. It is equipped with 400 arrow butts and three watchtowers, making it majestic and majestic. More than 400,000 green bricks were used to build the city wall, which were collected from 8 regions in 6 provinces, and 30% of the green bricks were engraved with the name of the place of origin.