Ключевые слова: arch, architecture, attraction, bridge, building, city, cityscape, construction, dom, douro, downtown, europe, evening, famous, hill, historic, historical, house, iron, iron bridge in porto, landscape, luis, metal, metro, old, oporto, pedestrian, porto, portugal, portuguese, river, sky, steel, structure, subway, tourism, town, traditional, transport, transportation, travel, urban, view, water,