Ключевые слова: ancient, arch, blue, boat, bridge, buildings, center, city, cityscape, culture, destinations, douro, down, downtown, embankment, gold, harbor, hill, historic, historical, horizontal, house, light, nautical, nice, night, old, orange, overview, part, port, porto, portugal, portuguese, quayside, reflection, ship, sky, terraced, tourism, town, travel, unesco, vessel, water, yellow,