Hanging Temple, half a day high, three horsetails hanging in the air, this folk song describes the Hanging Temple. Hangkong Temple is located between the cliffs on the west side of Hengshan Mountain in Hunyuan County, Datong City, Shanxi Province. It was built in the late Northern Wei Dynasty 1400 years ago. It is the only unique temple in China that integrates Buddhism, Taoism and Confucianism. Looking up from the bottom of the mountain, I saw a temple standing tall on a cliff almost straight up and down. It skillfully utilized the principle of mechanics, based on the flying beams inserted into the mountain, and supported the whole temple by relying on the rocks between the cliffs. When I climbed the Hangkong Temple and looked around, I saw a wooden pole sticking in the cliff, walking on the corridor, occasionally shaking, my heart could not help shaking. Here the railings are very low, only to the thigh position, feeling very suspense. Looking down again, the straight up and down cliffs make people dizzy. It deserves to be selected as the top ten unstable buildings in the world by Time Magazine.