Piatra Altarului Cave, considered to be one of the most beautiful caves in Europe, protected area in Apuseni Mountains, Romania adrianlawson January 3, 2024 UncategorizedPiatra Altarului Cave, considered to be one of the most beautiful caves in Europe, protected area in Apuseni Mountains, Romania#rumanien, #stalagmites, #Stalactites, #beautiful, #underground