People gather in Revolution Square as Pope Francis celebrates Mass in Havana, Cuba, Sunday, Sept. 20, 2015, where a sculpture of revolutionary hero Ernesto "Che" Guevara and a Cuban flag decorate government buildings. Pope Francis opens his first full day in Cuba on Sunday with what normally would be the culminating highlight of a papal visit: Mass before hundreds of thousands of people in Havana's Revolution Plaza. (AP Photo/Alessandra Tarantino)