Ключевые слова: adventure, alghero, calm, cave, cavern, chamber, columns, dark, darkness, discovery, exploration, exploring, famous place, geologic, geological, geology, grotto, inside, italy, lake, landmark, limestone, natural, nature, neptune, neptunes grotto, nettuno grotto, no one, no people, reflection, rock formations, rocky, rugged, saltwater, sardinia, scenery, scenic, shadow, speleology, stalactite, stalagmite, toilet, tourism, tourist attraction, touristic, touristy, travel destination, underground, wonder,