Stone Mantle Introduction: The length, height and width of the Boyue Cave cave and the strange and strange beauty of the lava are truly rare. There are caves in the caves, halls within halls, miraculous craftsmanship, and views at every step; the cave is full of stalactites, stalagmites stand upright, stone pillars are like forests, and stone curtains are like curtains, hanging in various postures, full of pearls, and beautiful.