Introduction to Tongtian Avenue: Tongtian Avenue is located in the deep valley in the middle of Tianmen Mountain. It winds along the mountain cliffs and is the only way to pray for blessings and pilgrimage to Tianmen. It has a total length of 10.77 kilometers and an altitude difference of nearly 1,100 meters. It is densely covered with 99 sharp bends that rotate at 180°, interlocking and layered, like fluttering jade belts lingering in the sky, which is called "winding road".