It is one of the most important Renaissance buildings in central Germany, which has experienced no structural changes to this day and is preserved in almost its original condition.

Landgrave William IV immediately decided to make the city one of his secondary residences.

The halls were labeled with Roll - equipped and strapwork, just as they are adorned with decorative paintings - which includes a copy of the Iwein epic in Hartmann von Aue the basement.

The organ receives its special timbre from 252 wooden pipes, six registers and its so-called bird cry.

The castle houses the permanent exhibition Dawn of a new era, with the main topics Renaissance, Reformation and Schmalkaldic League.