Funny, we don't see it anymore, but there are a lot of these castles in our surroundings. I count at least 6 within a 5 km radius of my house. Castle Hoensbroek, Amstenrade, Terborg, Rivieren, Terworm, Cortenbach. Not all of them very large, but larger than the numerous strengthened farms that you find here.
A quick sketch made during lunchbreak, on my way between a client and the office. The weather was too nice not to go out of the car. Schets van Kasteel Cortenbach in Voerendaal.