Tianmen Mountain Tongtian Avenue is a winding mountain road located in the famous Tianmen Mountain National Forest Park in Zhangjiajie. Tianmen Cave has become a gateway to the sky in people's hearts because of its earthing, and Panshan Highway leading to Tianmen Cave is also known as "Tongtian Avenue". Tongtian Avenue has a total of 99 curves, which are surrounded by jade belts, closely curved and overlapping. According to the mountain walls, it rushes directly to the clouds. The situation of Tongtian Avenue is dangerous. It is even more dangerous to winding through the mountain walls and "the world's first highway spectacle". It is recognized as "the top ten Panshan highways in China".