Pope Benedict XVI opens his arms as he celebrates his installment Mass in St. Peter’s Square at the Vatican, Sunday, April 24, 2005. Dignitaries and an estimated 500,000 pilgrims, many of them from the pontiff’s native Germany, arrived in Rome for the ceremony to formally install Pope Benedict XVI and offer the pontiff a major chance to set the tone for his papacy. (AP Photo/Alessandra Tarantino)