Ключевые слова: architecture, art, black, blue, boat, bridge, building, cathedral, catholic, central, christian, church, city, cityscape, collection, cologne, dark, dusk, europe, european, evening, german, germany, gothic, hall, high, hohenzollern, koeln, landmark, light, monument, mood, night, old, orange, outdoor, railway, reflection, rhine, river, sky, skyline, three, tourism, tower, town, urban, wall, water,