Longyou Grottoes are located in Longyou County. This grotto was discovered in 1992. It is said that it was sensational that year, and it is still relatively deserted, but I just like this feeling of quiet and no one disturbs. I have seen a lot of holes. This kind of artificial excavation is indeed the first time I have seen it. And this kind of recovery is rare, if you think other attractions are the same, then it is recommended to see, it is worthy of nine unsolved mysteries, it is worth a visit.