Brussels is the capital of Belgium and by some standards also the capital of the European Union (because the parliament resides here). Tourist will enjoy both the bi-lingual, international position and ancient market square in the city center. A "must see" is also "manneke pis", a little guy that cannot stop peeing...
Bruges (Brugge) is a beautiful city in Western Vlaanderen. Lots of tourists visit the medieval city center and admire the buildings of 17th century. There is also a lot of excellent Belgium Chocolate and 250 kinds of Belgium Beer! Catch a boat ride here or in the nearby city of Gent.
Antwerp is the 2nd largest city of Belgium. It features a major international harbor as well as one of the diamond centers of the world. The old railway station is also worth a visit where trains depart from 4 vertical (!) levels.
Gent is a beautiful city in Western Vlaanderen. Lots of tourists visit the medieval city center and admire the buildings that date back to the 12th century. Gent is birthplace of Carl the Great, who was the ruler of a large part of Europe around 1500 AD. Catch a boat ride here or in the nearby city of Brugge.
Spa is one of Belgium's most popular tourist destinations, being renowned for its natural mineral springs and production of "Spa" mineral water, which is exported worldwide. The name Spa is used worldwide for hot springs and health treatments. Spa is also close to the car racing circuit of Francorchamps.
Leuven is an old city with great central town square. It is also home to the oldest university in Belgium and the largest beer brewer in the world.