Introduction to the Ancient Great Wall: The ancient Great Wall here was built in the Qin, Yan, and Jin dynasties. It was mostly made of earth and stone, and there are still obvious ruins today. The Great Wall of Qin is distributed in the southern mountains of Ximeng, extending in a curved way in difficult terrain. It is mostly built with earth and stone barriers and has passes, passes, and important roads; the Great Wall of Yan is distributed in Duolun County, West Wuzhumuqin Banner, and Abaga Banner. The territory meanders for thousands of miles, extending on vast grasslands. There is still a tall earth ridge left in the above buildings.