Nine steel spheres built for a world’s fair that was supposed to be dismantled six months later, and never was.
What it costs
Ticketed, and it is not cheap. What you buy is the lift to the top sphere with its view, the escalators between the lower spheres, and the exhibitions inside them.
Free from the outside, and the outside is what most photographs are of. A combined ticket with the ADAM design museum next door exists, and there is a separate one for Mini-Europe at its foot.
When to go
Open daily, long hours, and the queue is real in summer and at weekends — book a slot if you can. The top sphere closes to visitors before the rest of the building does.
Getting there
Metro 6 to Heysel/Heizel, about twenty minutes from the centre. It is nowhere near anything else on this list, so give it its own half-day.
If you only have an hour
Not enough — the round trip alone is forty minutes. If you are already at Heysel, do the exterior and Mini-Europe’s fence line for free and save the ticket for a day you have three hours.
What people get wrong
It was built for Expo 58 and meant to stand for six months. It represents an iron crystal magnified 165 billion times — not an atom, which is the usual description. Three of the nine spheres have no public access at all, because they have no vertical support.
Nearby
Ticketing arrangements and opening patterns as published for 2026 and checked on 5 September 2026. These change without much warning — confirm with the site itself before you travel. More sights, and how they fit together, in Landmarks & Sights.