The national cathedral, free to enter, and the quietest large interior in central Brussels.
What it costs
Free to go in. Two things inside are separately ticketed: the archaeological crypt beneath the nave, showing the Romanesque church that stood here first, and the treasury.
When to go
Open daily, closed to visitors during services. It is rarely crowded — most of the day-trip traffic never climbs the hill to it, which is exactly why it is worth the ten minutes.
Getting there
Metro 1 or 5 to Gare Centrale; it is a two-minute walk, on the slope between the two halves of the city.
If you only have an hour
Fifteen minutes inside for the stained glass, then walk down to the Galeries through the streets behind it, which are quiet and almost never photographed.
What people get wrong
The stained glass is the reason to go — sixteenth-century Renaissance windows, unusually complete, because the building escaped both the 1695 bombardment and serious war damage. Royal weddings and state funerals happen here rather than at any of the more famous churches.
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.