Ключевые слова: architecture, arrabida bridge, boats, bridge, buildings, city, cityscape, dom luis, dom luiz, douro, europe, european, famous, historic, historical, history, houses, landmark, old, oporto, panoramic, porto, porto cityscape, portugal, portuguese, quay, red roof tiles, ribeira, river, riverside, sky, skyline, tourism, touristic, tourists, town, traditional, travel, urban, urban planning, view, viewpoint, water, world heritage site,