Photo Gallery: 2012 Ash Wednesday Ceremonies 25/117

An unidentified Cardinal puts ash on Pope Benedict XVI's head during the celebration of Ash Wednesday mass at the Basilica of Santa Sabina, in Rome, Wednesday, Feb. 17  2010. Ash Wednesday marks the beginning of Lent, a solemn period of 40 days of prayer and self-denial leading up to Easter. (AP Photo/Alessia Pierdomenico, pool)