The 102-meter-tall structure in Brussels that represents an iron crystal magnified 165 billion times is the Atomium.
Built for the 1958 Brussels World's Fair, the Atomium was designed by engineer André Waterkeyn with architects André and Jean Polak. Its nine stainless-steel-clad spheres represent atoms arranged in the body-centered cubic structure of an iron crystal, specifically a form that can represent ferrite. The enormous model was intended to celebrate scientific progress and Belgium's engineering achievements during the Atomic Age.
The Atomium is not a literal atom or a model of a single molecule. It is an architectural representation of a crystal unit cell, enlarged to a height of 102 meters. The connecting tubes contain stairs, escalators, and a lift, while several spheres hold exhibitions and public spaces. The top sphere includes a restaurant with panoramic views of Brussels.
A common mix-up is confusing the Atomium with the nearby Centenary Palace or with Brussels landmarks such as the Grand Place. The building was extensively renovated from 2004 to 2006 and remains one of Belgium's best-known landmarks.