Really enjoyed my walk around the interior. I like to imagine myself an invading attacker and figure out all the different ways the defenders would have to kill me on my way to storming the keep. In Cahir's case, the answer is a lot. Cahir has multiple lines of defense and puts a lot of barred doors (and a portcullis!) with accompanying kill-zones between you and a desired change in ownership. Lots of layers of inward facing killing machinery await you if you penetrate the outer walls.