Ключевые слова: alps, background, beautiful, beauty, blue, central switzerland, city, cruise, europe, flag, harbor, holiday, kkl, lake, lake lucerne, landscape, lucerne, luzern, mount rigi, mountain, nature, paddle wheel steamer, panorama, paradise, pier, rigi, scenic, ship, sky, stadt luzern, steam, steamboat, summer, swiss, switzerland, tourism, transportation, travel, vacation, view, water, white, worth seeing,