A banner is displayed ahead of Pope Francis' visit at the Basilica of the National Shrine of the Immaculate Conception Monday, Sept. 21, 2015, in Washington. Pope Francis will celebrate Mass Wednesday at the basilica, the largest Catholic church in the United States and North America, with a crowd of about 30,000.

Credit: (AP Photo/David Goldman)

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…