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Installment Mass Photos

Pope Benedict XVI, flanked by rows of cardinals, takes his place during his installment Mass in St. Peter's Square at the Vatican, Sunday, April 24, 2005. 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.

(Photo: AP)