Ключевые слова: architecture, art, boat, bridge, building, center, city, cityscape, douro, drawn, embankment, europe, european, famous, gaia, historic, historical, illustration, landmark, landscape, luis, luiz, metal, nova, old, oporto, ponte, port, porto, portugal, portuguese, railway, ribeira, river, sketch, sky, skyline, tourism, town, traditional, tram, transport, travel, urban, view, vila, villanova, water, watercolor, watercolour,