— — an iron crystal, walked from the inside.
“Nine polished spheres held in space above the Heysel plateau, built for the 1958 World's Fair and never taken down. The shape is the unit cell of an iron crystal, scaled up 165 billion times. Tubes connect the spheres; escalators and a lift carry visitors through them to a restaurant in the top ball. From the panoramic windows, Brussels lays itself out toward the Royal Palace of Laeken and the green wedge of the Sonian Forest.
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The Atomium stands on the Heysel plateau in the Laeken district of Brussels, about 5 km north of the Grand Place. It was designed by Belgian engineer André Waterkeyn with architects André and Jean Polak for Expo 58, the first post-war World's Fair, and opened in April 1958. The structure rises 102 metres and consists of nine stainless steel spheres each 18 metres in diameter, connected by 20 tubes. The spheres represent the body-centred cubic unit cell of an iron crystal at a magnification of 165 billion.
Originally clad in aluminium, the spheres were stripped and re-skinned in polished stainless steel during the 2004 to 2006 renovation, restoring the silvered look the engineers intended. The central vertical tube carries what was, at opening, the fastest lift in Europe, climbing to the top sphere in 23 seconds. Five of the nine spheres are open to visitors; the rest are structural. The interiors host the permanent Expo 58 exhibit and rotating shows on design, science, and the post-war Belgian century.
The Atomium is open daily, with last entry around 17:30 in standard season, and stays lit each evening through the night. Adult admission was 16 euros in 2024; combined tickets pair it with the nearby Mini-Europe park and the Design Museum Brussels. The closest metro is Heysel/Heizel on Line 6, a five-minute walk west across the plaza. The top sphere holds a panoramic restaurant; the queue is shortest in the first hour of the day and in the last hour before close, when the spheres turn warm against the Brussels sky.