Ключевые слова: arc, arch, architecture, boat, bridge, city, cityscape, connect, connecting, construction, cross, crossing, culture, destinations, douro, duoro, eiffel, europe, european, famous, harbor, historic, iron, journey, landmark, light, metal, nautical, oporto, pier, place, porto, portugal, portuguese, ribeira, river, scene, scenic, scenics, sky, skyline, steel, street, tourism, tower, traditional, travel, urban, vertical, vessel, viaduct, walkway, water,