large cave chamber of jenolan caves, australia

attraction australia australian calcite cave cavern caves chamber crystal crystalline deep destination discovery eerilylit finest flowstone flowstones forces formation formations fossils geological geology ground hall historical history illuminated illumination inside jenolan landscape lighted lights limestone magic minerals natural nature old oldest pattern pure rare river rock rocky scenery show silurian spectacular speleology stalactite stalactites stalagmite stalagmites structures subterranean symmetry system timeless touristic underground underworld layering large