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