The fortress Ludwigsvorfeste of the Fortress of Ulm on Europastraße in Neu-Ulm in the state of Bavaria. The ruins are part of a park and used as a restaurant. The Fortress is one of five federal fortresses and Europe`s largest fortress. It was built in the 19th century around the cities of Ulm and Neu-Ulm and consists of several forts, towers, fortresses and defense facilities