Founded in the 12th century, this fascinating monastery complex not only survived wars, fires, and various political upheavals, but also managed to preserve a great many historic manuscripts, books, documents and objects. The two library halls are true architectural gems, and are a must see. The monastery is beautifully located on a hill overlooking the city, and affords great views of the castle and the city. To top it all, the abbey has its own brewery and a restaurant. Their St Norbert beer is very good and is definitely worth a try.