Ключевые слова: aerial, architecture, austria, austrian, bridge, building, canal, castle, cathedral, city, cityscape, danube, donaukanal, donaustrase, europe, historic, landmark, landscape, obere, office, old, outdoors, panel, panorama, panoramic, power, scenic, sky, skyline, skyscraper, solar, summer, sweden, tower, travel, urban, vienna, view, wien,