When the Vatican announced that World Youth Day would be held in Denver in 1993, many news experts predicted that the event would be a failure. The United States, they said, was different than countries like Poland and Argentina, where previous World Youth Days had met great success. The United States, they claimed, lacked an entrenched tradition of Catholic pilgrimage, the traveling distances required to assemble a large gathering from across the country were too large, and most importantly American young people would simply be uninterested in the pope or his message. On August 10, 1993, stunned reporters crumpled their...