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Zitadelle Petersberg forms the crowning glory of Erfurt's past. This well preserved fortress was built on a Benedictine monastery in 1665. It was built primarily to protect the the German Electorate at the time from Protestant attacks. Further on, it served as a military outpost during the two world wars. Sections of the site were opened to the public from 1963 and from the 1990s it underwent planned restoration. The main attraction remains the eerie labyrinth of passageways that lies beneath the fortress. Tourists flock to the site to explore the area and one can also hire the help of tour guides from the region.