A general view of the Benjamin Franklin Parkway is seen from the steps of the Philadelphia Museum of Art looking towards City Hall in Philadelphia on November 17, 2014. As part of the events surrounding the World Meeting of Families -- Philadelphia 2015 set to be held September 22-27, 2015, Pope Francis will celebrate a papal Mass on the parkway that is expected to draw over 1 million worshippers, according to Donna Crilley Farrell, executive director, World Meeting of Families -- Philadelphia 2015. Photo courtesy of REUTERS/Tom Mihalek
*Editors: This photo may only be republished with RNS-PHILLY-POPE, originally transmitted on April 20, 2015.
PHILADELPHIA (RNS) The city is experienced in holding events for crowds of 1 million-plus. But this one differs not only in size but in the number of security organizations involved: the Department of Homeland Security, the FBI, the CIA, the Secret Service, the Italian police force, the Swiss Guard, as well as city and state police.