Introduction to the Great Wall of the Han and Ming Dynasties: The ruins of the Great Wall of the Han and Ming Dynasties run through Yongchang for about 120 kilometers from east to west. It was first built in the Han Dynasty and added to in the Ming Dynasty. The existing part can be roughly divided into three sections: the eastern section from Qingshanbao to Minqin County boundary, more than 40 kilometers long; the middle section from Jinchuan to Crescent Lake in the west, more than 20 kilometers long; and the western section from Yangzhuangzi in Wangxinbao Village to Xiuhua Temple , more than 20 kilometers long. The walls in most areas are about 4 meters high, with clearly rammed layers, and in some places the wall stacks are still there. Two inner and outer city walls were built, with protruding beacons and majestic beacons.