Grottoes are full of novelty seekers, and grottoes are full of mystery-guessers. What this sentence says is Longyou Grottoes. Longyou Grottoes are located in Quzhou, north of Longyou County. If you come from the center of Quzhou City, you just need to go to Longyou Station to take a taxi. It's not convenient, but you still make do. It's about 20 minutes'drive from Longyou Station. Because Quzhou's tourism policy is free of charge from Monday to Friday, there is no ticket collector at the entrance. After entering, there is a playback studio that you can see first. This studio mainly introduces Longyou Grottoes and some of its major conjectures. Before entering the grottoes, there was a place similar to an antique park. In fact, many Grottoes could be seen along the way. At present, only five Grottoes have been developed, which can be visited. Most of the others are still submerged in the water. The discovery of Longyou Grottoes is also interesting. In the legendary bottomless pond of the local people, several farmers used several pumps to pull it out. It turned out that there were holes in it. At first, they thought it was an abandoned mining field, so they didn't get much attention until six years later. After entering the cave, you will find that the temperature is much lower than that outside. It is 15-20 & The first cave in advance is a fresco carving of Eight Immortals crossing the sea. This is because the peasants at that time thought it was a Taoist holy place, so the portrayal, now it seems to have destroyed the cultural relics here. Besides, there are Buddha statues in it. What is worth watching most is that there are pillars on the top. Such open space has not collapsed really is quite severe. It was done before B.C. It's not easy to have such a level of construction. Most of the remaining open grottoes are almost the same, but the size is a little different. Of course, the last grotto even has the original sculpture of horses, so the year of this grotto was set before the Warring States Period to the Han Dynasty. Several major conjectures about this grotto, such as mining theory, armament theory, refuge theory, tomb theory, etc., have their own reasons, but they can easily be overthrown. But it is certain that such a large-scale project in the past was done by the emperor, but there is no conclusive evidence to prove the use of this cave, and there is no record in the history books. It is a mysterious worker. Cheng's unsolved mystery, I hope I can see scientific breakthroughs in my lifetime, find the mystery.