cave formation with rare helictites

abstract ancient attraction attractions australia australian calcite cave cavern caves chamber crystal crystalline delicate deposits destination discovery display dripstone eerilylit enchanted exploration fairytale feature finest fishtail forces formation formations fossils geological gravity grotto hall helictite helictites illuminated inside jenolan landscape lighted lights limestone lit magic minerals mysterious mystic natural nature nsw old pure rare ribbon scenery show silurian sparkle speleology speleothem stalactites stalagmites stone straws structures subterranean symmetry timeless touristic under underground underworld unique layering