A beautiful gravel road that climbs up from 's-Gravenisjes in the Vlaamse Voerstreek (Belgium) with an increasingly beautiful view of the same region behind you. At the top you finish at the border marker of the Dutch border. The road is also paved from here onwards.
Perhaps even more beautiful to cycle as a descent, because of the previously described views.
Very rough for a racing bike, although I've survived on 28mm tires. Better to cycle with a gravel bike ;-)