Driving into the ancient city, as if entering the scene in the TV scene, this is another hidden world. Yongtai The ancient city has a history of more than 400 years and was built by the Ming government to defend against the invasion of minorities in the north. Upon completion, it will become a military fortress, and Lanzhou will be stationed in this castle. At that time, there were more than 2,000 soldiers in the city and 500 horsemen. There were gunpowder fields, forage yards, mills, and horse farms. The city wall is made of loess, with a circumference of 1717 meters, a wall height of 12 meters, a city base of 6 meters and an area of 318 acres. The entire city plane is elliptical, the city gate opens to the south, the outer gate is built, the outer door is called "Yongning Gate", the inner door is called "Yongtai Gate", and the door is slightly westward, resembling a glans. Today, there are less than 100 people living in this ancient city, most of them old people and children. Most of the villagers here are mainly grazing, just happened to return to the flock. At this moment, I really want to be a shepherd here.