The modern museum is located in the middle of the romantic castle ruins of Hayn. It shows three exciting exhibitions every year and a new permanent exhibition on the multifaceted history of the city of Dreieich and the castle. Since 2011, the museum has been owned by the Geschichts- und Heimatvereins e.V. (History and Home Association of) Dreieichenhain, which is also the owner of the castle.