The entrance to the former concentration camp in Dachau, Germany, bears the Nazi slogan "Work Makes You Free." The gate was stolen over the weekend. Johannes Simon/Bongarts/Getty Images hide caption

itoggle caption Johannes Simon/Bongarts/Getty Images

Mois Yussuroum, a 94-year-old retired dentist, fought the Nazis as part of the Greek resistance during World War II. "Of the 650 Greek Jews who fought in the resistance, I'm the only one still alive," he says. Joanna Kakissis/NPR hide caption

itoggle caption Joanna Kakissis/NPR