Na Die
Google
The gardens are nice, but that's it. You can't see much from the castle since it's not open to the public, and the small part that you can see is rubbish. They have a new exhibition in there which is an offense to every artist. If art for you is a white plastic chair with tights sticking out (in the shape of saggy balls), then it's the place for you. Otherwise, don't waste your time in the "gallery" .
Edit: price also went up to 10,50€ per adult and not 9€ anymore like some of the older reviews mentioned