Longyou Grottoes is one of the highest level underground artificial buildings in ancient China. It is also a great spectacle of the development and utilization of underground space in the world. It is a profound reflection of the Chinese nation. The Longyou Grottoes can be traced back to 212 BC and have been discovered so far. The world's largest ancient underground man-made architecture when the ancient secret cave is covered with gorgeous neon, when the mysterious ancient caves hit modern technology, slash-and-burn taiji gossip future technology, alien mysterious characters, raging war ...... light whispered the story of Li Majun, everything in this is known as the world's ninth wonder, Longyou Grottoes Longyou Grottoes have a long history, sleeping in the ground For thousands of years, the scale of the magnificent atmosphere is magnificent and magnificent, and it is like a time to go back to the grotto. It is like going back time and returning to thousands of years ago. However, its mining age and its use are mysterious. So far, no direct knowledge about the origin of the grotto has been seen. The exact record of the reason Each grotto in Longyou is a magnificent hall with a inverted bucket shape, one side steep, one side inclined at an angle of about 45 degrees, the four walls straight and ribbed Distinct, uniform line chisel, gouge arranged regularly in order to understand the history of changes in the light heavy, looking cool caves in the middle of summer