Explore the Mysterious Longyou Grottoes

Located in Longyou County, Zhejiang Province, the Longyou Grottoes are a rare ancient underground world. They are grand, magnificent, and exquisitely crafted, and are known as the "Ninth Wonder of the World" by locals. The first thing you will notice when you enter the grottoes is how cool it is. The deeper you go, the cooler it gets. I estimate that the temperature difference between the inside and outside is at least 15°C. It's like a free air-conditioned room. The "year of excavation," "excavators," and "purpose" of the grottoes are all mysteries that have remained unsolved for thousands of years.