FILE - In this Jan. 13, 1995 file photo, the bullet-proof vehicle carrying Pope John Paul II is surrounded by Filipinos waving their arms in greeting as it enters the grounds of the University of Santo Tomas in Manila, Philippines. Philippine officials estimate that as many as 6 million people will attend the Mass that Pope Francis celebrates Sunday, Jan. 18, 2015 in Manila’s Rizal Park. That would be a record for any pope, but not for any event. A look at some of the biggest gatherings of humanity: (AP Photo/Bullit Marquez, File)