Pope Benedict XVI waves to the crowd while arriving at Revolution Square to officiate a mass in Havana March 28, 2012. Pope Benedict will step onto Cuba's biggest stage on Wednesday with a public mass in Havana's Revolution Square as he wraps up a trip that began with a blast at communism and will end with a visit with Fidel Castro. REUTERS/Desmond Boylan (CUBA - Tags: RELIGION POLITICS TPX IMAGES OF THE DAY)