Ключевые слова: above, aerial, architecture, beautiful, blue, bridge, building, center, city, cityscape, douro, downtown, europe, european, heritage, hill, historic, historical, history, horizon, house, landmark, landscape, medieval, old, oporto, outdoor, panorama, panoramic, porto, portugal, portuguese, red, ribeira, river, roof, rooftops, scenic, sky, skyline, street, summer, tourism, town, traditional, travel, unesco, urban, view, water,