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 102 mtr’s (335ft)tall. Its nine 18mtrs (59ft)in 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.