Ключевые слова: abstract, ancient, beautiful, bright, cave, cavern, caves, closeup, dark, darkness, deep, entrance, exploration, from, geologic, geological, geology, inside, interior, italian, italy, landscape, light, limestone, macro, mountain, mysterious, national, natural, nature, nobody, old, park, rock, sardinia, shadow, speleology, stalactite, stalagmite, stone, system, tourism, tourist, travel, tunnel, underground, wall, waterfall, world, zuddas,