Pope Francis (L) walks with Jacek Majchrowski (C), the mayor of Krakow, after arriving aboard a city tram on his way to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became the first pontiff to hop on an ordinary city tram Thursday as he travelled to the opening ceremony of an international Catholic extravaganza in Poland. / AFP PHOTO / JOE KLAMAR