Ключевые слова: aerial, ancient, architecture, blue, boat, bridge, city, cityscape, day, douro, embankment, europe, european, famous, hill, historic, historical, history, house, landmark, landscape, medieval, mediterranean, old, oporto, outdoors, panoramic, porto, portugal, portuguese, ribeira, river, roof, scene, ship, sky, skyline, summer, tourism, town, traditional, travel, urban, view, water,