Located in the beautiful town of Mainz, the Mainz Citadel is an old fortress built in the 17th century replacing a 11th century Benedictine monastery. The fortress has a rich history; after the Napoleonic battles, the fortress was under the control of the German confederation. It has been an important part of the World Wars as it functioned as a camp for war prisoners and was later in the hands of French forces. Now, it is under the administration and ownership of the Mainz city and houses many government offices. Notable in the fortress is the Drusus Monument, the Historical Museum of the Town Mainz and old barracks from the World War II. It hosts the Open-Ohr youth festival since 1975 which is attended by many locals and tourists alike. An initiative to preserve the cultural value of the citadel, Zitadelle Mainz Initiative (IZM) was started in 2004.