Pope Francis gives mass at Revolution Square in Havana, on September 20, 2015. Pope Francis greeted massive crowds of fans and Catholic faithful Sunday as he arrived in his popemobile to give mass on Havana's iconic Revolution Square, the highlight of his trip to Cuba. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis gives mass at Revolution Square in Havana, on September 20, 2015. Pope Francis greeted massive crowds of fans and Catholic faithful Sunday as he arrived in his popemobile to give mass on Havana's iconic Revolution Square, the highlight of his trip to Cuba. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis (C) walks to the altar arrives to give mass at Revolution Square in Havana, on September 20, 2015. Pope Francis greeted massive crowds of fans and Catholic faithful Sunday as he arrived in his popemobile to give mass on Havana's iconic Revolution Square, the highlight of his trip to Cuba. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis gives mass at Revolution Square in Havana, on September 20, 2015. Pope Francis greeted massive crowds of fans and Catholic faithful Sunday as he arrived in his popemobile to give mass on Havana's iconic Revolution Square, the highlight of his trip to Cuba. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
People cheer as Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
A man holds a poster welcoming Pope Francis at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Cuban President Raul Castro (C) waits for the arrival of Pope Francis at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / LUIS ACOSTA (Photo credit should read LUIS ACOSTA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / LUIS ACOSTA (Photo credit should read LUIS ACOSTA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
People gather at Revolution Square in Havana for a mass to be given by Pope Francis on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / RODRIGO ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Pope Francis arrives at Revolution Square in Havana on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pontiff's eight-day tour will also take him to the United States. AFP PHOTO / ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)
CUBA-POPE-VISIT-MASS
Cubans wait for catch a glimpse of Pope Francis as he arrives at Revolution Square in Havana, on September 20, 2015. Pope Francis will give mass on Revolution Square, the biggest event of his trip to Cuba, with nearly a million people expected to attend. AFP PHOTO / Rodrigo ARANGUA (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)