Pope Benedict XVI through the years

18 of 38: In this picture made available by the Vatican newspaper Osservatore Romano, Pope Benedict XVI, center, walks in the yard of Colegio de Miraflores in Leon, Mexico, Saturday March 24, 2012. Benedict arrived in Mexico Friday afternoon, a decade after the late Pope John Paul II's last visit, and will travel to Cuba on Monday. (AP Photo/Osservatore Romano)

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