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Cuban revolutionary leader Fidel Castro. (Photo by Fox Photos/Getty Images)

Cuban revolutionary leader Fidel Castro.    (Photo by Fox Photos/Getty Images)

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1971: Cuban prime minister Fidel Castro speaking at a press conference. (Photo by Keystone/Getty Images)

1971:  Cuban prime minister Fidel Castro speaking at a press conference.  (Photo by Keystone/Getty Images)

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HAVANA, CUBA -- CIRCA 1977: Fidel Castro smokes a cigar in his office in Havana, Cuba, circa 1977. (Photo by David Hume Kennerly/Getty Images)

HAVANA, CUBA -- CIRCA 1977: Fidel Castro smokes a cigar in his office in Havana, Cuba, circa 1977. (Photo by David Hume Kennerly/Getty Images)

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1979: The Cuban revolutionary Fidel Castro, Prime Minister from February 1959, addressing the United Nations in New York. (Photo by Keystone/Getty Images)

1979:  The Cuban revolutionary Fidel Castro, Prime Minister from February 1959, addressing the United Nations in New York.  (Photo by Keystone/Getty Images)

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Former Cuban President Fidel Castro delivers a speech during the commemoration of the 50th Anniversary of the Committees of Defense of the Revolution (CDR) September 28, 2010 in Havana. AFP PHOTO/ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)

Former Cuban President Fidel Castro delivers a speech during the commemoration of the 50th Anniversary of the Committees of Defense of the Revolution (CDR) September 28, 2010 in Havana.  AFP PHOTO/ADALBERTO ROQUE (Photo credit should read ADALBERTO ROQUE/AFP/Getty Images)