Ключевые слова: arc, arch, architecture, blue, bridge, building, city, cloud, concrete, construction, crane, crossing, curve, design, device, dramatic, elegant, engineering, europe, giant, highway, industrial, industry, lifting device, light, modern, perspective, pier, polygon, porto, portugal, power, river, road, shape, sky, spectacular, steel, strength, strong, structure, support, suspension, tower, transportation, travel, triangle, view, water, white,