The Castle is definitely worth the effort of climbing up to, and it has lots of pretty side paths which you can explore.
It has 4 floors of exhibits-an art gallery, history of the castle and restoration, history about the castle as a prison, and the bottom floor which is the cellars of the prison. If you are short on time, I would recommend starting at the bottom with the casements.
The history stuff, although interesting was not displayed in an interesting way. Perhaps, they are still working on it, but it involves a lot of reading. Reading materials are provided in each area in several languages.
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