Overpass introduction: The overpass is located in the south of Maoji and on the top of Yingying Mountain. It is the largest natural stone arch bridge discovered in northern my country so far. The overpass flies between two dangerous cliffs in the north and south, with a span of 50 meters, a height of 200 meters, and a width of 5 meters. From a distance, it looks like a huge mountain gate opening, which makes people admire the uncanny workmanship of nature.