Located in Heysel Park in the north of the city, the centerpiece of the 1958 Brussels World's Fair is at 335 feet high one of Belgium's tallest structures, and still the city's most popular tourist attraction (to the tune of more than 600,000 visitors annually). It's home to a museum about Expo '58 and temporary exhibitions about Belgium and the digital arts.

More info: Atomium.be.

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