Introduction to Tianmen Cave: There is a huge stone standing on the top of the volcanic rock of Tianmen Mountain in the shape of a door. The door is 13 meters high and 7 meters wide. The mountain is named after the door. There is Tianmen Temple around Tianmen, which is a relic of the Ming Dynasty. After that, there is the Sun and Moon Skylight, also known as Sun Cave and Moon Cave. There is a poem on the cave wall that says: "The wandering mind is more leisurely than the meditation, and the origin of the world network has nothing to do with it." The Buddha is speechless and the lion is crouching. The nine temples are like embroidered moss. The rocks on the cliff are leaning towards the sun, and the clouds are lost in the mountains across the harbor. I am currently staying in Tushita Palace, and I have entered the green space."