Pope Francis (2ndL) celebrates a mass at the site known as the Cenacle, or Upper Room, bringing into sharp focus a decades-long debate over prayer rites at the site where Christians believe Jesus had his Last Supper on May 26, 2014 in Jerusalem's Old City. Pope Francis called for people of all faiths to have access to often hotly-contested sacred sites in Jerusalem, on the final day of his whirlwind Middle East trip. AFP PHOTO/ POOL / JACK GUEZ