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The Atomium is a 102-metre-tall structure representing an iron crystal magnified 165 billion times. Built for the 1958 World's Fair (Expo 58), it was intended to be temporary but became Brussels' most recognisable landmark.
Designed by engineer André Waterkeyn and architects André and Jean Polak. The nine spheres represent a unit cell of an iron crystal. A 2006 renovation replaced the original aluminium cladding with stainless steel.