wolf`s lair wolfsschanze, wolfschanze, wilczy szaniec - adolf hitler`s first military headquarters in world war ii, gierloz near

adolf barbarossa blastresistant building bunker bunkers camouflaged complex concrete east eastern first forest fort fortification germany gierloz green headquarters history hitler hitlers ketrzyn lair leaves masuria masurian military moss natural nature nazi nickname old operations poland prussia rastenburg reinforcement ruins stone szaniec trees war wilczy wolfs wolfschanze wolfsschanze woods world wwii