Neuhardenberg (, ) is a municipality in the district Märkisch-Oderland, in Brandenburg, in north-eastern Germany. It is the site of Neuhardenberg Palace, residence of the Prussian statesman Prince Karl August von Hardenberg (1750–1822). The municipal area comprises the villages of Altfriedland, Quappendorf and Wulkow. Neuhardenberg is part of the Amt ("collective municipality") Seelow-Land.
During the Third Reich, the Ministry of Aviation (RLM) used the estate of Count ( Graf) Hardenberg to establish an auxiliary airfield known as E-hafen. This was a secret test site for rocket motors and rocket boosters, developed by Hellmuth Walter and Wernher von Braun.
Later, Count von Hardenberg held clandestine meetings at the mansion in preparation for the 20 July plot to kill Hitler. After its failure, he was arrested and his properties were seized by the Nazi Germany authorities. During World War II, there were two forced labour subcamps of the Stalag III-C prisoner-of-war camp in the settlement. In 1945 Hardenberg again had to face the condemnation of his estates by the Soviet Military Administration. The mansion was turned into a school building. From 1957 on the Marxwalde airfield, built in the 1930s, was extended as the base of an East German Air Force wing.
After reunification the manor was restored to the Hardenberg family and acquired by the Deutscher Sparkassen- und Giroverband saving banks association in 1996. After renovation it was reopened in 2002. It is today used as a conference building but also for cultural events.
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