1) Air-raid shelter 
The Führerbunker (`Leader`s bunker`) was an air-raid shelter located near the Reich Chancellery in Berlin, Germany. It was part of a subterranean bunker complex constructed in two phases which were completed in 1936 and 1944. It was the last of the Führer Headquarters (Führerhauptquartiere) used by Adolf Hitler. Hitler took up residence in t......