The views from the Citadel are well worth the climb. The Citadel itself is okay in the normal big-castle, here's some history and a bunch of architecture, stuff. But it's the views that make it great. So often, places touted as having great views turn out to disappoint, but not in this case. Once at the top, I took a few photos most of which centred around the vast and majestic (though not, it must be mentioned, blue) Danube. And having done so, I walked back down.