Adolf Hitler spent over half of WWII (~800 days) in Der Wolfsschanze (wolf’s lair), his bunker in Ketrzyn, Poland (East Prussia).
Hitler’s nickname Wolf was used in titles of Nazi headquarters throughout occupied Europe – e.g. Wolfsschlucht I and II in Belgium and Werwolf in Ukraine. Although often translated in English as “lair,” Schanze in German alludes to a “sconce” or “redoubt.”
Within >80 buildings (including massive bunkers for Hitler and high-ranking German Officials like Hermann Göring and Martin Bormann) many decisions such as the construction of death camps and the fate of European nations were made in the Wolfsschanze.