Ключевые слова: adventure, alghero, ancient, calm, cave, cavern, dark, discovery, exploration, exploring, famous place, formation, geologic, geological, geology, grotto, hidden, illuminated, inside, italy, lake, limestone, mediterranean, mysterious, natural, natural beauty, nature, neptunes grotto, nettuno cave, no one, no people, reflection, rock formations, rugged, sardinia, scenic, shadow, speleology, stalactite, stalagmite, toilet, tourism, tourist attraction, touristic, touristy, travel, travel destination, underground, wonder,