Ключевые слова: architecture, blue, boats, city, cityscape, clouds, de, district, douro, downtown, dramatic, dusk, europe, european, evening, famous, gaia, hill, historic, historical, night, nova, old, oporto, panorama, port, porto, portugal, portuguese, purple, red, ribeira, river, sky, skyline, sunset, tourism, town, travel, view, vila, water,