Ключевые слова: arch, arch bridge, architecture, attraction, blue, boat, building, cais de ribeira, cityscape, douro, douro river, europe, famous, historic, historical, historical centre, history, iberia, iberian peninsula, landmark, luis, old, old town, oporto, portuguese, ribeira, rio, river, river bank, riverside, sky, tourism, town, traditional, travel, truss, urban, vessel, water, watercourse, wine, wrought iron,