Pope Benedict XVI (37 images)

Clergymen gather around the alter as Pope Benedict XVI delivers mass at Yankee Stadium on April 20, 2008 in New York. Benedict, who is on his first trip to the U.S. as pontiff, is finishing up his visit which began in Washington DC. (UPI Photo/Monika Graff)

A member of the Roman Catholic clergy prepares the offering for communion prior to Pope Benedict XVI's mass at Nationals Park in Washington on April 17, 2008. Approximately 50,000 people are expected in attendance for the Pope's mass. (UPI Photo/Kevin Dietsch)

A member of the clergy stands with an outstretched hand near the left field foul pole (as if he were reaching for a pop fly at the fence) as he waits for Pope Benedict XVI to celebrate mass at Nationals Park in Washington on April 17, 2008. Approximately 50,000 people are expected in attendance for the Pope's mass. (UPI Photo/Roger L. Wollenberg)

Pope Benedict XVI acknowledges the crowd prior to delivering mass at Nationals Park in Washington on April 17, 2008. Approximately 50,000 people are expected in attendance for the Pope's mass. (UPI Photo/Kevin Dietsch)