Four months before German troops blew up many of the buildings in the compound in the face of the Red Army's advance, the "Wolf's Lair" was the scene of the abortive attempt to assassinate Hitler.
The German army officer Claus von Stauffenberg detonated a briefcase bomb that failed to kill the Nazi leader while he was attending a staff meeting on July 20, 1944. Von Stauffenberg was executed along with many other plotters.
After communism's collapse, the Polish authorities leased out the complex to a private company called Wolf's Nest, which tried to exploit its tourist potential.
The company turned some of the bunkers into a restaurant and hotel and opened an indoor shooting range in the offices used by General Alfred Jodl, a staff officer sentenced to death at the Nuremberg war crimes trials.
The Polish historian Jan Oldakowski has described the complex as a "grotesque Disneyland".
"The biggest change here over the past decade has been the introduction of a cash machine," said Lukasz Joachymek, a freelance tour guide. Independent