Ключевые слова: adventure, cave, cavern, dark, details, discovery, earth, ethereal, experience, exploration, features, formation, geology, guided tour, hidden gems, history, illuminated, intricate, journey, landscape, mira de aire, mystical, natural light, natural wonder, nature, pathway, portugal, rock formation, rocks, shapes, stalactites, stalagmites, stone, tourism, tourist attraction, travel, underground, views, visitors, walkway,