The Fortress can be visited
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Fortress Wülzburg
On Wülzburger Berg in Bavaria, Germany, stands Wülzburg Fortress. Originally a Benedictine monastery, it was transformed into one of the most significant Renaissance fortresses in the German-speaking world at the end of the 16th century.
History+
The origins of Wülzburg lie in a Benedictine monastery founded in the 11th century. At the end of the 14th century, it fell into the hands of the Burgraves of Nuremberg. In 1537, the monastery was dissolved. Margrave Georg Friedrich the Elder of Brandenburg-Ansbach initiated its conversion into a fortress in 1588, which was completed around 1610. During the Thirty Years' War, the fortress was surrendered without a fight in 1631 but remained unconquered despite sieges. From the 17th to the 19th century, it also served as a state prison.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Luftbild_Wuelzburg.JPG?uselang=de
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 49.0255, 11.0048