he Atomium is a landmark building in Brussels, originally constructed for the 1958 Brussels Worlds Fair (Expo 58). It is located on the Heysel Plateau, where the exhibition took place. It is now a museum.

Designed by the engineer André Waterkeynand architects André and Jean Polak, it stands 102 m tall. Its nine 18 m diameter stainless steelcad spheres are connected, so that the whole forms the shape of a unit cell of an iron crystal magnified 165 billion times. Tubes of 3 m 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.