The tourist / festive places not to be missed in Belgium

You live more or less long in Belgium or you know VERY well the country.

What are in your area (or elsewhere) places not to be missed?

It can be a village, a city, a museum or an exhibition place, a natural site, a bistro / cafe / restaurant, an unusual place, an event, ....

No limit, except to say exactly where your suggestion is.

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