Poland : Bunker

Hitler's bunkers in Ketrzyn, Poland (North-Eastern Poland) are a formation of large command bunkers together with some support fortifications. This is the command center Hitler used during the Russian campaign. When the Russians got close Germans blown the bunkers up, through they knew the structural weakness points of the bunkers and used a whole train of explosives many of the bunkers were just slightly damaged on the outside. The walls were moved from few inches to about a meter or so. The bunkers have multi layered design to reduce damage from anti-bunker bombs. The fortifications were never bombed unless one counts one accidental drooping of a bomb by an allied bomber.