Around 1922 the Local History Museum of Düren County and the Town of Nideggen (Heimatmuseum des Kreises Düren und der Stadt Nideggen) was established in the fighting tower or bergfried.

The tower house suffered a direct hit during an air raid on 6 December 1944 and much of it collapsed.

Here there are models of castles in the Eifel mountain region between the rivers of the Moselle and Rhine and the German border.

Methods of torture and interrogation, medieval justice and incarceration are explained.

In the cellar, the dungeon can be seen in which the archbishops of Cologne, Conrad of Hochstaden and Engelbert II of Falkenburg were imprisoned.