People wave flags of Cuba and the Vatican, as Pope Francis arrives at Revolution Square in Havana to give his first mass of his visit to Cuba 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