On 20th July 1944 Colonel Claus von Stauffenberg put a bomb under Adolf Hitler's desk. Although the bomb exploded, it failed to kill the German Nazi leader. Alex Last spoke to Berthold von Stauffenberg, son of the WW2 army officer, in 2014.
Photo:Claus von Stauffenberg. Credit: Gedenkstaette Deutscher Widersta/AFP/Getty Images