Introduction to Tongtian Cave: It is embedded on a hundred-meter cliff. According to legend, during the Tang Dynasty, 12 Chinese monks from the Central Plains went to the Western Regions to preach scriptures, climbing over mountains and ridges and crossing deserts. After going through hardships, I came to Qiuci, entered the Grand Canyon and entered the Tongtian Cave while looking for the Holy Mountain of Foyuan. From then on, he transformed into an immortal and ascended to heaven.