United Nations Secretary General Ban Ki-moon with wife Yoo Soon-taek walk behind a guard carrying a wreath during a wreath laying ceremony at the Wall of Death in the former German Nazi Death Camp Auschwitz-Birkenau, in Oswiecim, Poland, Monday, Nov. 18, 2013. On the first day of his visit to Poland Ban Ki-moon came to Auschwitz and on Tueasday he will attend the U.N. Climate Conference held in Warsaw. (AP Photo/Alik Keplicz)