The ruins of the huge 16th-century Zeughaus are a rather impressive reminder of wartime destruction. Built as part of the city fortifications —largely for storage of weapons and grain — it helped save the city from occupation during the Thirty Years War. Plundered several times since, it had lost its purpose by the time Kassel was bombed in 1943; only the walls and facade remained. These have now partly been integrated in the adjacent school building.