Arriving at Expo 58: the Brussels World’s Fair. The Atomium was the centerpiece and symbol of the fair. Belgium, 1958

Source

[More information] (https://en.wikipedia.org/wiki/Expo_58) and [images.] (http://www.vecu.be/vecufotozoek.php?pays=E&prov=58&libsousthemenl=Expo%2058)