6015162 Nazi leader Adolf Hitler and his senior military staff looking at a model of part of the Siegfried Line, Germany (b/w photo) by German Photographer (20th Century); Private Collection; (add.info.: Nazi leader Adolf Hitler and his senior military staff looking at a model of part of the Siegfried Line, Germany. Illustration from The Second Great War, A Standard History, Volume Five (The Waverley Book Company Ltd in association with The Amalgamated Press Ltd, London, c1946).); 穢 Look and Learn.