Pope Francis writes on the guest book at the end of his visit in the Nazi German death camp of Auschwitz in Oswiecim, Poland, Friday, July 29, 2016. Pope Francis paid a somber visit to the Nazi German death camp of Auschwitz-Birkenau Friday, becoming the third consecutive pontiff to make the pilgrimage to the place where Adolf Hitler's forces killed more than 1 million people, most of them Jews. (L'Osservatore Romano /Pool Photo via AP)