After the Nazis came to power, the quarry was converted into an amphitheatre to be used for mass meetings and multimedia theatrical performances as part of the Thingspiel movement.
[1] The work entailed sealing salt-mining shafts and cavities and bringing in 1,200 tonnes of granite from Silesia as building material, since the anhydrite core of the hill itself is water-soluble.
[2][3] The theatre was dedicated on 10 October 1937 by Joseph Goebbels as the Feierstätte der Nordmark or Nordmark-Feierstätte (Northern March Ceremonial Site);[3][4] in his speech he expressed the wish it would be a "political church of National Socialism".
[2] Immediately after the war, the arena was used amongst other things for boxing[3] and for circus performances, before becoming the site of the Karl May Festival in 1952.
[4] Schaller did not do any further blasting, but used the existing shape of the quarry, so the arena is asymmetrical and has a smaller stage area to one side.