Ключевые слова: abstract, ancient, asia, background, bat, beautiful, cave, cavern, caving, dark, deep, destination, entrance, exploration, formation, geologic, geological, geology, grotto, hole, inside, interior, island, landmark, landscape, light, limestone, mineral, mountain, mysterious, national, natural, nature, nobody, old, park, rock, rocky, scenic, speleology, stalactite, stalagmite, stone, tourism, travel, tunnel, underground, view, wall, water,