Pope attends World Youth Day

Youngsters cheers while waiting for the arrival of Pope Benedict XVI at Barajas airport during World Youth Day 2011 celebrations on August 18, 2011 in Madrid, Spain.

Pope Benedict XVI waves as he boards a plane heading for Spain, August 18, 2011, at Ciampino Airport in Rome. The Pontiff headed to Madrid for a million-strong Catholic youth festival after Spanish riot police swung batons in clashes with anti-Church protesters over the cost of the six-day World Youth Day festival at a time of economic hardship.

Pilgrims hold flags on Cibeles square in Madrid, Spain, August 18, 2011, before a welcoming ceremony for Pope Benedict XVI.

Bishops gather for Pope Benedict XVI's welcoming ceremony at Cibeles square in Madrid, August 18, 2011.

Pilgrims wait for Pope Benedict XVI at the Nunciature in Madrid, August 18, 2011.

Nuns wait for Pope Benedict XVI at the Nunciature in Madrid, August 18, 2011.

Pope Benedict XVI speaks to the press aboard an Alitalia plane on the way to Madrid's Barajas airport, August 18, 2011. Pope Benedict XVI warned that Europe won't be able to emerge from its economic woes unless it realizes that economic policy cannot be guided by a profit-driven mentality alone. He said the continent must take into account ethical considerations that look out for the common good.

A young boy, wearing the uniform of the Vatican Swiss Guard yawns before the arrival of Pope Benedict XVI at Barajas airport during World Youth Day 2011 celebrations, August 18, 2011 in Madrid, Spain.

Spain's King Juan Carlos and Queen Sofia welcome Pope Benedict XVI upon his arrival at Madrid's Barajas airport, August 18, 2011.

A nun cheers while waiting for the arrival of Pope Benedict XVI at Barajas airport during World Youth Day 2011 celebrations on August 18, 2011 in Madrid, Spain.

A young faithful waves a Vatican flag as she waits for Pope Benedict XVI at Madrid's Barajas airport, August 18, 2011.

Priests are seen inside their temporary confession boxes as they wait for worshipers in Retiro Park ahead of the visit of Pope Benedict XVI in Madrid Wednesday, Aug. 17, 2011.

Pilgrims reacts as they wait for the Pope Benedict XVI on his way to Cibeles square in Madrid, on August 18, 2011, before a welcoming ceremony.

Pilgrims with an American flag react as they wait for Pope Benedict XVI on August 18, 2011 in Madrid.

Pilgrims get wet at Cibeles square in Madrid, on August 18, 2011, before a welcoming ceremony for Pope Benedict XVI. Temperatures Thursday were in the mid-nineties, and are expected to pass 100 degrees Fahrenheit on Saturday.

Pilgrims are sprayed with water as thousands wait for the arrival of Pope Benedict XVI in Madrid on Thursday, Aug. 18, 2011.

A young woman gets medical assistance after fainting at Cibeles square in Madrid, on August 18, 2011, before a welcoming ceremony for Pope Benedict XVI.

Pope Benedict XVI arrives on his Popemobile to Cibeles square in Madrid, August 18, 2011.

Pope Benedict XVI waves from his Popemobile in Puerta de Alcala square in Madrid on Thursday, Aug. 18, 2011.

Pope Benedict XVI waves to the crowd on his way from Barajas Airport to La Nunciatura Apostolica during the World Youth Day 2011 on August 18, 2011 in Madrid, Spain.

A gay couple kisses as Pope Benedict XVI waves to faithful from his popemobile on his way to Cibeles square in Madrid, August 18, 2011. Spanish police foiled plans by 100 gays and lesbians to stage a kiss-in on the route the visiting Pope Benedict XVI took through Madrid, blocking the protesters before they could meet up. The activists had planned to join up on the major artery Calle Serrano along which the pope later traveled in his white, bullet-proof popemobile for a welcoming cermony in Plaza Cibeles square.

Pilgrims scream as Pope Benedict XVI arrives in the Popemobile at the Nunciature in Madrid, on August 18, 2011.

A pilgrim looks on as she waits for Pope Benedict XVI on Cibeles square, on August 18, 2011.

A policeman looks at Cibeles square in Madrid, August 18, 2011. A million Catholic faithful were expected in Madrid this week for the week-long World Youth Day festival.

Pope Benedict XVI arrives on his Popemobile at Cibeles square for a welcoming ceremony in Madrid, on August 18, 2011.

Pope Benedict XVI arrives for a welcoming ceremony at Cibeles square in Madrid, on August 18, 2011.

Pope Benedict XVI arrives on a vast white stage adorned with an image of Mary and Jesus displayed in front of Madrid city hall at Cibeles square where he celebrated the World Youth Day's opening ceremony in Madrid, August 18, 2011.

Pope Benedict XVI walks with youths through the Puerta de Alcala, in Madrid, Thursday, Aug. 18, 2011. The Pontiff arrived in the Spanish capital of Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day.

Pope Benedict XVI and Madrid's archbishop Cardinal Antonio Maria Rouco Varela are seen at Puerta de Alcala during the World Youth Day 2011 on August 18, 2011 in Madrid, Spain.

Worshipers join Pope Benedict XVI, on stage at center, in a prayer at Madrid's Cibeles square Thursday Aug. 18, 2011.

Pope Benedict XVI arrives for a welcoming ceremony at Cibeles square in Madrid, on August 18, 2011.

Faithfuls gather near the Cibeles square in Madrid on August 18, 2011 during a welcoming ceremony for Pope Benedict XVI.

A World Youth day volunteer carries water as a faithful is carried on a stretcher after fainting during Pope Benedict XVI's meeting with youths in Plaza de Cibeles, in Madrid, Thursday, Aug. 18, 2011.

Pope Benedict XVI receives a tree to be planted at the Puerta de Alcala (Door of Alcala) in Madrid on August 18, 2011.

On Wednesday in Madrid pro- and anti-World Youth Day supporters argue at Puerta del Sol square during a march against the papal events taking place in Spain. On Wednesday night, about 5,000 people opposed to the pope's visit marched peacefully to Madrid's central Puerta del Sol plaza. A smaller number of protesters then clashed with riot police. Police said eight demonstrators were arrested and 11 people were injured.

Protesters demonstrate against the public cost of the World Youth Day celebrations at the Puerta del Sol square in Madrid, on August 17, 2011. Thousands of protesters chanting "God yes, Church no!" took to Madrid's streets to decry the expense of a rock festival-style, million-strong youth party for Pope Benedict XVI at a time of economic crisis.

Protesters attend a demonstration against the public cost of the World Youth Day celebrations at the Puerta del Sol square in Madrid, August 17, 2011. More than 100 groups opposed to the visit marched across central Madrid Wednesday evening.

Protesters clash with policemen during a demonstration against the public cost of the World Youth Day celebrations at the Puerta del Sol square in Madrid, on August 17, 2011. Thousands of protesters chanting "God yes, Church no!" took to Madrid's streets to decry the expense of a rock festival-style, million-strong youth party for Pope Benedict XVI at a time of economic crisis.