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