Ключевые слова: architecture, boat, building, building exterior, central business district, city, cityscape, commerzbank tower, crane, famous, frankfurt, germany, hesse, high, landmark, liner, main, main river, office building, opera tower, opernturm, passenger liner, passenger ship, people, river, river bank, riverbank, riverside, ship, sightseeing, skyline, skyscraper, tall, tourists, tower, transport, transportation, urban, vessel, water, waterfront,