In this Wednesday, Sept. 16, 2015, file photo, a worker hangs banners ahead of Pope Francis' scheduled visit, on the Benjamin Franklin Parkway in Philadelphia. After months of angst over long security lines and onerous travel, organizers still expect more than a million people for Pope Francis’ outdoor Mass in Philadelphia. (AP Photo/Matt Rourke, File)

Photos: America prepares for Pope Francis

Pope Francis arrives in the United States for his historic visit on Tuesday, September 22, 2015. He’ll visit Washington D.C., New York and P…