Pope Benedict XVI waves to the crowd at the start of a welcoming celebration as part of the World Youth Day festivities in central Madrid, August 18, 2011.[Photo/Agencies]

Spain's King Juan Carlos (R) kisses the ring of Pope Benedict XVI next to Spain's Prime Minister Jose Luis Rodriguez Zapatero (C) after arriving at Madrid's Barajas airport from Rome, August 18, 2011. [Photo/Agencies]