What is "atomium"

The Atomium ( ) is a building in Brussels originally constructed for Expo 58, the 1958 Brussels World's Fair. Designed by the engineer André Waterkeyn and architects André and Jean Polak, it stands tall. Its nine diameter stainless steel clad spheres are connected so that the whole forms the shape of a unit cell of an iron crystal magnified 165 billion times. It is now a museum.

Tubes of diameter connect the spheres along the 12 edges of the cube and all eight vertices to the centre. They enclose stairs, escalators and a lift (in the central, vertical tube) to allow access to the five habitable spheres which contain exhibit halls and other public spaces. The top sphere includes a restaurant which has a panoramic view of Brussels. CNN named it Europe's most bizarre building.