Ключевые слова: arc, arch, architecture, bridge, city, cityscape, connecting, construction, cross, crossing, culture, destinations, douro, eiffel, europe, european, famous, harbor, historic, iron, journey, landmark, metal, nautical, nobody, oporto, pier, place, porto, portugal, ribeira, river, roof, scene, scenics, sky, skyline, steel, street, tourism, tower, traditional, travel, urban, vessel, viaduct, water,