Pope Francis will give mass Sunday on Revolution Square in Havana, the biggest event of his trip to Cuba, with nearly a million people expected to attend. The pope, who arrived on the communist island Saturday, will address the crowd beside a towering sculpture of his fellow Argentine Che Guevara's iconic silhouette, following in the footsteps of his predecessors John Paul II and Benedict XVI. Cuban President Raul Castro and Argentina's Cristina Kirchner will be among those in attendance. The pope's eight-day tour, which will also take him to the United States for the first time, follows the announcement of the US-Cuban rapprochement, which paved the way for the estranged neighbors to renew diplomatic relations in July.