Considering the Bastion Den Haag in The Hague?
A VT member wrote the following comment about visiting The Hague:
Binnenhof by bugulma
Binnenhof is a complex of buildings that look like the castle. It was founded in 1248, in the year of the city foundation. Since 1446 the place is the home for the city parament. Since 1982 one of the building of the complex is for prime minister of Netherlands by the way. Some pictures of Binnenhof you can find in my travelogue.