Pope Benedict XVI is welcomed by German President Horst Koehler after his arrival at the airport in Cologne. Pope Benedict XVI is welcomed by German President Horst Koehler (not pictured) after his arrival at the airport in Cologne August 18, 2005. Pope Benedict will face the toughest crowd of his four-month-old papacy when he visits the World Youth Day festival in Germany, where more than 400,000 lively young Catholics are expected to greet him. Although the youngsters from almost 200 countries are guaranteed to give the 78-year-old German a hearty reception, Benedict will come under scrutiny not only for what he tells his audience but the amount of charm and warmth he can muster. REUTERS/Michael Dalder