A policemn guards pilgrims that came from all over the world to pray during the Opening Mass on the first day of the World Youth Days, in Krakow, on July 26, 2016. Pope Francis heads to Poland Wednesday for an international Catholic youth festival with a mission to encourage openness to migrants made tougher by a fresh jihadist attack in France which has spooked and saddened pilgrims. / AFP PHOTO / JANEK SKARZYNSKI