Pope Benedict XVI waves participants of the 20th World Youth Day who gather on the bank of the river Rhine in western German city of Cologne. Pope Benedict XVI waves to participants of the 20th World Youth Day who gather on the bank of the river Rhine in western German city of Cologne August 18, 2005. Pope Benedict arrived in his German homeland on Thursday on the first international trip of his pontificate, a visit to the World Youth Day attended by hundreds of thousands of young Catholics. REUTERS/Tobais Schwarz