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The Great Wall of Shandan County is divided into two categories. One is the Great Wall of the Han Dynasty, which was built in the sixth year of Yuanding in the Western Han Dynasty (111 BC), more than 2,000 years ago. It has a total length of 98.5 kilometers and runs in an east-west direction. It is composed of trenches and natural river beacons. The entire line uses trenches instead of walls, which are still clearly visible despite the age. The second is the Ming Great Wall, which was built in the sixth year of Ming Longqing (1572), more than 400 years ago. The Great Wall of the Ming Dynasty was composed of walls, piers and barriers rammed with loess. The direction and length are the same as those of the Great Wall of Han Dynasty. The Great Wall of Han Dynasty is on the north side, and the Great Wall of Ming Dynasty is in it. The distance between the two is between 10 and 80 meters, and they extend parallel. Shandan Hanming Great Wall is a section of the ancient Great Wall that is relatively well-preserved in China at present, and is known as an "open-air museum".