Ключевые слова: architecture, big, bridge, city, cityscape, construction, douro, drive, eifel, engineering, europe, famous, history, home, iron, large, lines, metal, modern, monuments, old, oporto, porto, portugal, portuguese, railway, rapid, river, road, scene, skyline, speed, steel, structure, subway, town, train, tram, transport, transportation, travel, unicolor, urban, view, water,