Ключевые слова: architecture, background, blue, boat, boats, bridge, building, city, cityscape, color, dom luis, douro, europe, european, gaia, heritage, historic, historical, history, horizontal, iberia, iron, landmark, luis, margin, old, oporto, ponte, ponte dom luis i, porto, portugal, portuguese, ribeira, river, riverside, scenic, sky, tourism, town, traditional, transportation, travel, travel destinations, unesco, urban, vacations, water, wine, world,