This picture shows a Polish flag and a police helicopter flying over the Blonia Meadows in Krakow, on July 26, 2016, where pilgrims from all over the world celebrate the Opening Mass on the first day of the World Youth Days. 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 / Bartosz Siedlik