Pope Benedict XVI open-air mass at Terreiro do Paco

Pope Benedict XVI celebrates an open-air mass in the Terreiro do Paco in Lisbon, Tuesday, May 11, 2010. Tens of thousands of families, teenagers and elderly gathered in the Portuguese capital to greet the 83-year-old pontiff and, in many cases, offer support to the Catholic leader as he battles the Church's biggest crisis in decades.

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