Introduction to Xianren Cave: Xianren Cave is 4 kilometers away from the Ma'anling volcano crater. The stone carvings of "Wizard in the Stone Chamber" on the basalt at the entrance of the cave are eye-catching. There are holes in the carvings. When people cleaned up the sediment in the cave in the 1950s, they discovered Polished stone tools similar to ax chisels may have been the site of cave dwellings by human ancestors.