Well, first of all I'm not a real tourist. I live in a little city, 50 miles West of Brussels, but as train connections in Belgium are excellent and rather cheap, it's an easy daytrip to my capital, the only real 'big' city in my country.
Foreign tourists usual only visit the city center, the Atomium in the West and maybe the splendid museums in the East.
I love to explore the other, unknown but often pretty parts of Brussels.
Brussels is not a big, European metropolitan city as London, Paris or Moscow. But it's a big city to Belgian standards, though quite compact in size.
The Brussels Capital Region as it is called officaly has now got 1.126.000 inhabitants on 62 sqm or a density of 17.000 inh/sqm. The metropolitan area (Brussels and suburbs like Vilvoorde, Zaventem, Tervuren) has got a population of about 1.850.000. So you can compare Brussels with a North American city like Montréal.
But of course, Brussels is also the capital of Flanders, of Belgium, the headquarter of NATO, houses hundreds of multinationals, thousands of lobbyists and hosts of course lots of European institutions, like the European Commision (gouvernment), the European Parliamant, the Council of the EU etc... So about 300.000 beaurocrats come to work to Brussels every day, mostly from the Flanders region, which makes the city much bigger than it's inhabitants only.
And of course, this part of Europe is very dense populated, with cities groing to each other. So Brussels is also part of the
Flemish Diamond, an important, urban area in the north of Belgium with 5 million people, all well connected by public transport and highways.
Btw, the photos with cows were taken in the very Western part of the population, and are part of the many green spaces in and around the city.