Walk Brussels, clear the fog
FOG covers the entire world map. Brussels only appears where your feet have actually been, and the Pentagon is a very satisfying shape to fill.
A pentagon and a hill
Brussels keeps its shape from a wall that is no longer there. The inner ring road traces the old city defences, and the ground inside it is still called the Pentagon. It is about two kilometres across. Inside, the street plan is medieval: short, crooked, cobbled, and rarely aligned to anything.
The other thing to know is the hill. The Lower Town, around the Grand-Place, the Bourse and Rue du Marché aux Herbes, is flat. The Upper Town, Place Royale, the Sablon and Rue de la Loi, sits a good sixty metres above it. Every crossing between the two is a climb, whether you take the Mont des Arts steps, Rue de la Montagne, or the long ramp past the cathedral. Bring shoes for cobbles that are wet more often than not.
An afternoon route that clears real ground
Start at the Grand-Place, then work outward instead of standing in it. Rue des Bouchers and the Galeries Royales Saint-Hubert take you north, then cut up the hill through Mont des Arts to the Parc de Bruxelles. Follow Rue Royale south to Place Royale, drop into the Sablon, and keep going to the Palais de Justice.
From the terrace behind the courthouse, take the free lift down into the Marolles. Rue Haute and Rue Blaes run back toward the centre through the flea market on Place du Jeu de Balle. That loop is about six kilometres, crosses four distinct districts, and covers far more separate streets than a longer walk down one boulevard would. In FOG terms, zigzagging beats distance.
Past the ring: nineteen communes
Brussels is not one municipality, it is nineteen, and the map does not care where one stops. Ixelles has the two ponds and Place Flagey. Saint-Gilles has the town hall quarter and some of the best Art Nouveau frontages in Europe. Schaerbeek climbs toward Josaphat park. Molenbeek sits across the canal, which is the sharpest edge in the city and a good straight line to walk along.
South of the ring, Avenue Louise runs dead straight for two kilometres to the Bois de la Cambre. It is one long stripe on the map and it fills fast, but the grid on either side, the Châtelain and Bailli streets, is where the percentage actually moves. East, the European Quarter around Schuman is glass and traffic on a weekday and nearly empty at the weekend, which makes Saturday the better time to walk it.
Rain, cobbles and the covered options
The honest climate note: it drizzles. Brussels spreads its rain across most of the year rather than concentrating it in a season, so waiting for a clear week is not a plan. Walk in it. Winter days are short and grey and the city looks better under lights anyway.
When it is genuinely pouring, the arcades still count. The Galeries Royales Saint-Hubert, the Passage du Nord and the Rue Neuve run give you covered ground that is still ground. The tram tunnels do not, so if you want a stretch of street to appear on your map, stay above it.
How FOG handles it
FOG starts with the whole world under fog. Every street you physically walk is revealed permanently, and it stays revealed. There is nothing to sign up for and nothing to sync, because the map never leaves your phone.
Background exploring means you can put the phone away and keep walking. The city percent readout tells you exactly how much of Brussels you have lit, a number that starts small and moves in a way you will recognise. Ranks climb with the area you cover: Wanderer, Scout, Pathfinder, Explorer, Voyager.
Questions people actually ask
Does FOG cost anything to try in Brussels?
It is free to explore. One single purchase of USD 5.99 unlocks unlimited ranks, every character and history import. There is no subscription, ever.
Do I have to keep the app open while I walk?
No. Background exploring keeps revealing streets with the app closed and the screen off, which is useful in Brussels drizzle.
Can I add walks I did before I installed it?
Yes, with the paid unlock. History import reads Google Timeline exports and GPX files, so old Brussels walks can be filled in.
Does the app have Brussels routes or guides built in?
No. FOG has no curated routes, no local guides and no city-specific features. It is the same world map everywhere, and only the streets differ.
Where is my map stored?
On your phone. No account, no sign-up, no cloud, no analytics, no ads and no tracking. You can export your own data whenever you want.
Start with a dark map.
FOG is free to explore. No account, no subscription, and your map never leaves your phone.
free to explore · one purchase unlocks everything · never a subscription