Ключевые слова: architecture, bridge, bridge luis 1, building, cathedral luis bridge, city, cityscape, construction, douro, douro portugal, downtown, duero, dusk, europe, european, evening, famous, gaia, historic, historical, history, house, iron, landmark, landscape, luis, metal, old, oporto, ponte, port, portugal, portuguese, postage, river, sky, skyline, sunny, sunset, tourism, tourist attraction, town, traditional, transportation, travel, travel destination, twilight, unesco, view, water,