A worshipper wears a shirt reading "I'm catholic" during a mass held by Pope Benedict XVI on the airfield in Freiburg, southern Germany, on September 25, 2011, on the last day of the Pontiff's first state visit to his native Germany. The 84-year old pope, German born Joseph Ratzinger, had a packed program, with 18 sermons and speeches planned for his four-day trip to Berlin, Erfurt in the ex-German Democratic Republic and Freiburg. AFP PHOTO / THOMAS KIENZLE