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Pope Benedict XVI holds the pastoral staff as he celebrates a mass at the Cuatro Vientos airport during the Catholic Church's World Youth Day celebrat...

Pope Benedict XVI greets the crowd before leaving from Madrid's Barajas airport, Sunday Aug. 21, 2011. The Pontiff leaves Madrid after a four-day visi...

Spain's King Juan Carlos kisses Pope Benedict XVI's hand, left, before leaving from Madrid's Barajas airport, Sunday Aug. 21, 2011. The Pontiff leaves...

Pope Benedict XVI, center, walks to his airplane accompanied by Spain's King Juan Carlos and Spain's Queen Sofia before leaving from Madrid's Barajas...

Pope Benedict XVI waves to faithful from his popemobile as he arrives to celebrate a mass on a vast dusty esplanade outside Madrid during the World Yo...

Pope Benedict XVI waves to faithful from his popemobile as he arrives to celebrate a mass on a vast dusty esplanade outside Madrid during the World Yo...

A bishop looks on as he waits for a mass which will be celebrated by Pope Benedict XVI on a vast dusty esplanade outside Madrid during the World Youth...

(From) Spain's King Juan Carlos, Spain's Queen Sofia and Madrid's archbishop, Cardinal Antonio Maria Rouco Varela arrive for a mass which will be cele...

Pope Benedict XVI arrives on his Popemobile to celebrate a mass at the Cuatro Vientos air base outside Madrid during the World Youth Day (WYD) festivi...

Pope Benedict XVI (L) celebrates a mass at the Cuatro Vientos air base outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011....

Pope Benedict XVI arrives to celebrate a mass at the Cuatro Vientos air base outside Madrid during the World Youth Day (WYD) festivities on August 21,...

Pope Benedict XVI (C) celebrates a mass at the Cuatro Vientos air base outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011....

Pope Benedict XVI (L) celebrates a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011. A vi...

Pope Pope Benedict XVI arrives on his Popemibile to celebrate a mass at the Cuatro Vientos air base outside Madrid during the World Youth Day (WYD) fe...

US pilgrims gather gather for a mass celebrated by Pope Pope Benedict XVI at the Cuatro Vientos air base outside Madrid during the World Youth Day (WY...

Chinese pilgrims gather gather for a mass celebrated by Pope Pope Benedict XVI at the Cuatro Vientos air base outside Madrid during the World Youth Da...

Pope Benedict XVI celebrates a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011. A violen...

Pope Benedict XVI (2ndL) celebrates a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011. A...

Pope Benedict XVI (C) meets pilgrims as he celebrates a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities on...

Pope Benedict XVI (3rdL) celebrates a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities on August 21, 2011. T...

Priests kneel in front of Pope Benedict XVI celebrating a mass on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) festivities o...

Brazilian pilgrims hold the WYD cross during a mass celebrated by Pope Pope Benedict XVI at the base of Cuatro Vientos, eight kilometres (five miles)...

Pope Benedict XVI (2ndR) is helped by assistant at the end of a mass celebrated on a vast dusty esplanade outside Madrid during the World Youth Day (W...

Pope Pope Benedict XVI celebrates a mass at the Cuatro Vientos air base, eight kilometres (five miles) southwest of Madrid on August 21, 2011. The nex...

Pope Pope Benedict XVI (L) celebrates a mass at the Cuatro Vientos air base, eight kilometres (five miles) southwest of Madrid on August 21, 2011. The...

Pilgrims carry the WYD cross during a mass celebrated by Pope Benedict XVI on a vast dusty esplanade outside Madrid during the World Youth Day (WYD) f...

Spain's Queen Sofia (R) kisses the hand of Pope Benedict XVI (L) under the look of Spain's King Juan Carlos at Barajas' airport before the Pontife's d...

( 1424921g ) Crown Princess Letizia and Crown Prince Felipe attend a 'Prayer Vigil' at the Cuatro Vientos (Four Winds) air base Pope Benedict XVI vi...

Pope Benedict XVI, center, waves to the pilgrims from the entrance at the Almudena Cathedral in Madrid Spain, Saturday Aug. 20, 2011. The Pontiff arri...

Pope Benedict XVI greets the faithful as he arrives to attend a vigil prayer at the Cuatro Vientos airport during the Catholic Church's World Youth Da...

Pilgrims wait for Pope Benedict XVI's arrival at Cuatro Vientos airport in Madrid, Saturday Aug. 20, 2011. The Pontiff arrived in Spain for a four-day...

Pope Benedict XVI, right, waves to the pilgrims as he leaves at Almudena Cathedral in Madrid, Saturday, Aug. 20, 2011. The Pontiff arrived in Madrid...

Pilgrims reacts during a religious ceremony with Pope Benedict XVI in Cuatro Vientos, near Madrid, Spain, Saturday Aug. 20, 2011, The Pontiff arrived...

Hundreds of thousands of young pilgrims gather in blistering heat on a vast dusty esplanade outside Madrid to hear a prayer vigil led by Pope Benedict...

Pope Benedict XVI leds a "Prayer Vigil" at the Cuatro Vientos (Four Winds) air base in Madrid on August 20, 2011 during the World Youth Day (WYD) fest...

Pope Benedict XVI leds a "Prayer Vigil" at the Cuatro Vientos (Four Winds) air base in Madrid on August 20, 2011 during the World Youth Day (WYD) fest...

Pope Benedict XVI (L) leds a "Prayer Vigil" at the Cuatro Vientos (Four Winds) air base in Madrid on August 20, 2011 during the World Youth Day (WYD)...

Pope Benedict XVI speaks at the San Jose Institute Foundation during World Youth Day celebrations. Madrid, SPAIN - 20/8/2011.

Pope Benedict XVI speaks at the San Jose Institute Foundation during World Youth Day celebrations. Madrid, SPAIN - 20/8/2011.

Crown Prince Felipe and Princess Letizia atten at prayer vigil led by Pope Benedict XVl at Cuatro Vientos Airport during World Youth Day celebrations....

Pope Benedict XVI leads a prayer vigil at Cuatro Vientos Airport during World Youth Day celebrations. Madrid, SPAIN - 20/8/2011.

Pope Benedict XVI speaks at the San Jose Institute Foundation during World Youth Day celebrations. Madrid, SPAIN - 20/8/2011.

Pilgrims react as they approach Pope Benedict XVI and kiss his right hand, at Cuatro Vientos airport in Madrid, Spain, Saturday Aug. 20, 2011. The Po...

Pope Benedict XVI is greeted by youths as he leaves Madrid's Apostolic nunciature, Madrid, Spain, Friday, Aug. 19, 2011. The Pontiff is in Spain for a...

Pope Benedict XVI is greeted by youths as he leaves Madrid's Apostolic nunciature, Madrid, Spain, Friday, Aug. 19, 2011. The Pontiff is in Spain for a...

Pope Benedict XVI attends to the re-enactment of the Way of the Cross procession held at Cibeles Square in Madrid, Spain on 19 August 2011. Benedict X...

Pope Benedict XVI is greeted by youths as he leaves Madrid's Apostolic nunciature, Madrid, Spain, Friday, Aug. 19, 2011. The Pontiff is in Spain for a...

Pope Benedict XVI gestures to the crowd at at Cuatro Vientos airport in Madrid, Saturday Aug. 20, 2011. The Pontiff arrived in Madrid for a four-day v...

Pilgrims are sprayed with water to cool them as they wait for Pope Benedict XVI's arrival at Cuatro Vientos airport in Madrid, Saturday Aug. 20, 2011....

Pope Benedict XVI is seen at Cuatro Vientos airport in Madrid, Saturday Aug. 20, 2011. The Pontiff arrived in Madrid for a four-day visit on the occas...