The fortress is a large complex and you can walk just about everywhere. But beware, there are many steep steps and low corridors that are dark. It can be slippery in a lot of places.
Do wear good shoes!
Of course you should also NOT risk your life for the perfect photo. That fence did not look very solid to me. Trust me: it's a looong way down! You'd think, once the kiddos have grown up, you wouldn't have to run after them all the time. Goes to show!
Or (photo 1) you'll end up in a cell, you will!
Or (photo 2) possibly you will be stretched on a nasty machine for punishment. Or maybe you'll be thrown in a dungeon (photo 3) with just one small opening 6 metres above your head. And if you've been really bad, you may be hung from the outside wall (photo 4)