Pope Francis walks inside the Auschwitz the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks towards the main entrance with the lettering "Arbeit Macht Frei" (Work Sets You Free) at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
PPope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks towards the main entrance with the lettering "Arbeit Macht Frei" (Work Sets You Free) at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
TOPSHOT - Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors.(JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks towards the main entrance with the lettering "Arbeit Macht Frei" (Work Sets You Free) at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis passes the main entrance with the lettering "Arbeit Macht Frei" (Work Sets You Free) at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors.( JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis passes the main entrance with the lettering "Arbeit Macht Frei" (Work Sets You Free) at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors. ( JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks towards at the former Nazi German Auschwitz-Birkenau death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants.(FILIPPO MONTEFORTE/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
JANEK SKARZYNSKI/AFP/Getty Images
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors.( JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016.
Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi German death camp where he will pray with Poland's chief Rabbi Michael Schudrich for its 1.1 million victims and meet with Holocaust survivors. ( JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves through the main entrance gate to the Auschwitz Nazi death camp on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis leaves through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis walks through the entrance of the former Nazi death camp of Auschwitz on July 29, 2016 in Oswiecim as part of his visit to the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (JANEK SKARZYNSKI/AFP/Getty Images)
Pope Francis Visits Auschwitz-Birkenau
Pope Francis arrives in Brzezinka part of the former Nazi concentration camp, Auschwitz-Birkenau in Brzezinka, Poland on July 29, 2016, during the World Youth Days (WYD).
Pope Francis is in Poland for an international Catholic youth festival with a mission to encourage openness to migrants. (KLAMAR/AFP/Getty Images)
