Torterry C.
Yelp
This definitely is my favorite park in Brussels. It didn't take long for me to fall for this place. First of all, It is the biggest park inside the city centre, beside the size, there are also couple very cool museums around, such as Museé Royal De L'Armée Et D'Histoire Militaire, Jubelparkmuseum and Autoworld. Arc de Triomphe gate also is here, pretty cool gate, reminded me a bit the Brandenburg gate in Berlin. the easy way to get here is take the metro, you can get off at the station Schauman or Merode.
Like I mentioned before, the park itself it is quite big, prefect place for a walk, get some fresh air and just chill. this is a very beautiful park, clean and organized. It surely a great place to escape from the busy city for a short time. It's also great place make some awesome pictures since the Arc de Triomphe is here. What a great park!