Ключевые слова: ancient, antique, attraction, beautiful, calcite, cave, cavern, dark, darkness, deep, earth, entrance, formation, geologic, geological, geology, grotto, history, hole, indoor, inside, interior, landmark, landscape, light, limestone, mineral, moist, mountain, natural, nature, old, park, rock, rocky, shape, sightseeing, speleology, stalactite, stalagmite, stone, structure, subterranean, tourism, tourist, travel, tunnel, underground, wall,