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A few older faces in the crowd at World Youth Day gathering

The AP reports that Pope Benedict XVI will arrive in Madrid on Thursday for a four-day visit to greet up to a million or more young pilgrims from around the planet for the Catholic Church's World Youth Day. The festivities kicked off in Spanish capital on Tuesday.

Susana Vera / Reuters

Pilgrims and Catholic nuns attend World Youth Day's opening mass at Madrid's Cibeles Square on August 16. Up to a million pilgrims are expected to attend various events during the week.

Rafa Rivas / AFP - Getty Images

Pilgrims wait near Cibeles square in Madrid on August 16 before a giant open-air mass.

Susana Vera / Reuters

Priests attend World Youth Day's opening mass at Cibeles Square on August 16.

Susana Vera / Reuters

Priests line up to give communion to pilgrims on August 16.

Susana Vera / Reuters

A priest takes off his robe after World Youth Day's opening mass on August 16.