Introduction to the city wall: The existing city wall of Panmen is more than 300 meters long and more than 5 meters high. Climbing up the stone ramp on the north side of the city wall, you can see the layout and structure of the entire Lumen and Shuimentao City. The battlements, crenels, perforations, gun holes, gates, winnowing stones, and patios (fire prevention facilities) on the city wall are all clearly visible.