Ключевые слова: ancient, antique, archeology, artificial, attraction, brige, calcium, cave, cavern, crystal, dark, earth, enter, erosion, formation, geological, geology, grot, grotto, hole, indoor, inside, interior, into, light, limestone, material, mineral, moist, mountain, natural, nature, old, rock, rocky, rough, sight, speleology, stalactites, stalagmite, stone, stones, structure, surface, texture, tourist, underground, wall, wood,