Brussels is the capital that makes fun of itself before you can. Its most famous statue is a bronze boy relieving himself, its government once went 589 days without being formed, and half the city seems to speak a different language from the other half. Then you walk onto the Grand-Place, a cobbled square that was almost wiped out by French cannon fire in 1695 and rebuilt within a few years, and the joke stops being funny. Around it you get Gothic stone, Baroque gold, the invention of Art Nouveau, the Expo 58 Atomium and the offices where the European Union does its work.
This is a city of layers and contrasts, not one big sight. A morning in a guildhall square, an afternoon with Magritte, an evening in a café where the beer list is longer than the menu. Most visitors give Brussels a day and tick off the square and the little statue. Five days is the right length because the best things are spread out: Horta's houses in Saint-Gilles, the flea market in the Marolles, the EU quarter on the east side, and one proper day trip to Ghent.
The plan runs by area. Day one is the Grand-Place, the arcades and the comics walls, day two the Marolles, the Sablon and the museums on the hill, day three the Art Nouveau houses and a lambic brewery, day four the Atomium and the EU quarter, and day five Ghent. For the country around it, see Belgium. Start on a Tuesday: the Royal Museums of Fine Arts, the Horta Museum and the Comic Strip Center are usually closed on Mondays, and the Parlamentarium only opens at 1pm that day. In November the Winter Wonders Christmas market starts late: in 2026 it runs from 27 November to 3 January, so early in the month you get the quiet city and the shorter days, with dusk around 5pm.