The Atomium is Brussels most iconic landmark and one of the most unique structures in the world. Built for the 1958 World Exposition, this 102-meter tall structure represents an iron crystal magnified 165 billion times. The nine interconnected spheres contain exhibitions about the 1958 Expo and Belgian design history, a panoramic restaurant, and a spectacular observation deck in the top sphere offering 360-degree views of Brussels. The ticket includes access to the Design Museum Brussels.