Ключевые слова: america, american, architecture, bridge, building, business, chicago, city, cityscape, color, commute, cta, day, district, downtown, financial, horizontal, il, ill, illinois, landmark, metro, metropolitan, modern, office, outdoors, platform, rail, railroad, railway, road, scene, sightseeing, skyscraper, states, station, street, subway, track, traffic, train, transit, transport, transportation, travel, united, urban, us, usa, way,