PHILADELPHIA — Six days ago, Pope Francis landed in Washington for his first visit to the United States — a country that he did not know and that did not know him. He flew out Sunday night, having wowed Washington and New York, while leaving behind a downtown Philadelphia transformed into a “Francisville” of pilgrims, families and hawkers selling Francis swag.

The Argentine pope, at 78, after enduring an exhausting schedule, seemed to have had fun, too.

“Please know that as I prepare to leave, I do so with a heart filled with gratitude and hope,” Francis said at Philadelphia International Airport before departing.