Ключевые слова: arches, architecture, boat, bridge, bridgework, channel, cityscape, connection, construction, cultural, destination, douro, engineering, european, framework, heritage, hillside, historic, iconic, industrial, infrastructure, journey, landmark, maritime, modern, nature, nautical, panorama, picturesque, porto, portugal, reflection, river, scenery, shipping, sightseeing, skyline, steel, steelwork, structure, sunlight, telephoto, tourism, tranquility, transport, travel, urban, view, water, waterfront,