Ключевые слова: architecture, bridge, buildings, city, city of port, cityscape, destination, douro, downtown, europe, european, famous, freedom, happy, historic, historical, holiday, houses, landmark, landscape, leisure, location, old, old town, outdoor, porto, porto portugal, portugal, portuguese, postage, river, road, scenery, sightseeing, sky, skyline, street, summer, tour, tourism, tourist, tourists, tower, town, traditional, travel, urban, vacation, vacations, view,