Pope Francis celebrates mass at the Basilica of Our Lady of Aparecida, Brazil's most revered Catholic shrine, in Aparecida, Sao Paulo State, on July 24, 2013. The first Latin American and Jesuit pontiff visited Aparecida to lead his first big mass since arriving in the country for a week-long visit of which highlight is the huge five-day Catholic gathering World Youth Day. AFP PHOTO / GABRIEL BOUYS