Overpass introduction: Overpass, 20 meters high and 40 meters long, with both ends connected to the ground, like a crescent moon. There are cliffs and deep valleys on both sides of the bridge, which is extremely thrilling. Tian Rongchao, a poet of the Ming Dynasty, praised the sky bridge and said: "Two mountains cut through an empty door, and a door split open the two mountains. How many gods can't close it, and only white clouds can seal it for many years."