I get goosebumps and my stomach sinks when I stand at the entrance to the Wolf’s Lair, Nazi leader Adolf Hitler’s war headquarters. Here the Führer lived from 1940 to 1944, directing the Nazis in World War II and the Holocaust that led to the deaths of some 6 million European Jews. Overall, World War II was the deadliest military conflict in history, killing some 70–85 million people. Here at the entrance to Hitler’s headquarters, my father stood guard, some 80 years ago. He told me about it, once I was old enough. He was a sergeant in the Greater Germany Guard Regiment. His job involved greet…