Pope Benedict XVI visits the United Nations in New York

Pope Benedict XVI (R) signs the guest book, as United Nations Secretary General Ban Ki moon (L) looks on, at the United Nations on April 18, 2008 in New York. Benedict, who is on his first visit to the U.S. as pontiff, will later visit St. Patrick's Cathedral, Ground Zero and then hold a mass at Yankee Stadium on at the conclusion of his visit on Sunday. (UPI Photo/Ezio Petersen)