United Nations Secretary General Ban Ki-moon, center, and his wife Yoo Soon-Tack walk through the entrance gate to 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. At right is former Auschwitz prisoner Marian Turski. (AP Photo/Alik Keplicz)