I don't remember how we found this, I think I just Googled castles close to the house so we could go take photos of the boys. Vickie took a TON of pictures of them and she is working on them to give us some for the living room. They haven't been updated since we 2001....oops!
There is a list of castles in The Netherlands (and other countries) here. Deurne is on my list to go soon and a post for Helmond is coming up!