While all the castles are in various states of repair and interest, there certainly are a lot of them.
Of course, with that many castles, there's bound to be a few that are famous for one reason or another.
Maybe Mel Gibson playing a Scottish rebel?
anyway, I digress.
Trim castle was actually used in the movie Braveheart, mostly because I'm assuming it's in overall pretty good condition. It still has the original castle walls and the keep is great shape too.