Introduction to Water Curtain Cave Hall: The first hall of Kaiyuan Karst Cave is called "Shui Curtain Cave Hall". The stalactites in the cave have different shapes, and the stone mantle, stone flags and stalagmites are pleasing to the eye. "Water Curtain Cave" is named after a small hole in the stone wall. The temperature in the cave is constant all year round, with the temperature remaining at around 15 degrees all year round. The words "Li", "Nv", "Yu" and other words vaguely discernible on the lion-shaped stalagmites were identified by experts as stone carvings from the Song Dynasty and have a history of nearly a thousand years. When Kaiyuan Cave was first discovered, people entering the cave found a pile of human bones under the stalagmites. It is speculated that Li Longji died here, and Zhao Xing, who came with him, wrote an inscription here.