stalactites in caves

artificial assembly background beautiful calcite calcium carbonate cave cavern caverns caves china chinese close color colorful colors corrosion development erosion exploration fall fantasy flute formations geology guangxi guizhou hang hanging hangs illuminated light lighted lights limestone mineral minerals natural night province purple reed river rock rocks scenery scenic shape special spectacular speleology stalactite stalactites stalagmite stalagmites stone stones subterranean touring tourism tourist travel traveling travels water waterfalls wonders