Ключевые слова: allegheny, america, american, architecture, beautiful, bridge, bridges, building, buildings, business, city, cityscape, district, downtown, dusk, evening, famous, financial, landmark, landscape, monongahela, night, office, ohio, pa, panorama, park, pennsylvania, pittsburgh, river, rivers, scene, scenery, scenic, skyline, skyscrapers, states, sunset, tourism, transportation, travel, twilight, united, urban, usa, view, water,