Migrants and refugees stand behind a locked metal door as Pope Francis and Ecumenical Patriarch Bartholomew I visit the Moria refugee detention center on the Greek island of Lesbos, Saturday April 16, 2016. Pope Francis gave Europe a concrete lesson Saturday in welcoming refugees by bringing 12 Syrian Muslims to Italy aboard his charter plane after an emotional visit to the Greek island of Lesbos, which has faced the brunt of Europe's migration crisis. (AP Photo/Petros Giannakouris), APTOPIX