Introduction to the ancient city walls of the Acropolis: There are two ancient city walls outside Zhenyuan City, winding along the Acropolis River and on Shiping Mountain in Fucheng. They are 5.1 kilometers long in total and 4-5 meters high. They are impressive and majestic and are known as "Miaoling Great Wall". The two ancient city gates opened in Linhe Cave are still well preserved.