'Alive!’ traces journey of boys hidden in concentration camp. Holocaust scholar Fred Rosenbaum's book: When American soldiers liberated the Buchenwald concentration camp near Weimar, Germany, on April 11, 1945, more than 900 boys, ages 7 through 18, most of whom had been sheltered in a clandestine underground barrack, were found alive. The odds-defying scope of these orphaned children’s lives...