Ключевые слова: adventure, ancient, archeology, attraction, beautiful, cave, cavern, colorful, dark, darkness, earth, erosion, geological, geology, grotto, history, hole, indoor, inside, interior, light, majestic, mineral, mountain, natural, nature, nobody, old, perspective, rock, rocky, sightseeing, speleology, stone, tourism, travel, tunnel, underground, vacation, wall,