Ключевые слова: architecture, berlin, blue, building exterior, business, busy, city, city life, city street, cityscape, cloud, concrete, day, empty, europe, germany, gray, heat, hot air balloon, illuminated, midday, modern, no people, office building exterior, potsdamer platz, sky, skyscraper, springtime, square, street, summer, temperature, town square, travel, travel destinations, urban skyline,