Ключевые слова: arc, arch, architecture, blue, building exterior, built structure, city, city life, cityscape, dusk, famous place, gateway arch, green, illinois, illuminated, midwest usa, mississippi river, missouri, monument, night, nobody, purple, reflection, river, sky, skyline, skyscraper, st louis, street light, sunset, tall, travel destinations, twilight, urban scene, usa, water, waterfront,