aerial view of the top of one of 3 east gate skyscrapers in belgrade

architecture belgrade serbia business capital cities cityscape downtown district east europe facade famous place gate horizontal modern people sky skyscraper steps staircases tourism tower travel urban skyline panoramic chimney istocna beograda rudo artificial building exterior finance industry concrete construction futuristic high angle view communism aerial drone point flying sunny us location outdoors city life street destinations international landmark 4k resolution mavic pro sunset smog