Photos: First U.S. cruise in decades arrives in Cuba
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Carnival's Adonia cruise ship arrives from Miami in Havana, Cuba, Monday, May 2, 2016. The Adonia's arrival is the first step toward a future in which thousands of ships a year could cross the Florida Straits, long closed to most U.S.-Cuba traffic due to tensions that once brought the world to the brink of nuclear war. (AP Photo/Ramon Espinosa)