Ключевые слова: architecture, building, center, church, city, cityscape, culture, day, destination, douro, downtown, europe, european, famous, hill, historic, historical, horizontal, landmark, monastery, mosteiro, old, old town, oporto, picturesque, place, port, porto, portugal, portuguese, river, sierra do pilar, site, tourism, town, travel, unesco, urban, view, world heritage site, world locations,