Ключевые слова: abstract, ancient, beautiful, bright, cave, cavern, caving, dark, darkness, deep, exploration, geologic, geological, geology, inside, interior, lake, landmark, landscape, light, limestone, mountain, mysterious, natural, nature, river, rock, scenic, shadow, speleology, stalactites, stalagmites, stone, sun, tourism, travel, tunnel, underground, view, wall, water,