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Welcome to the island's most impressive yet depressing sight. Located near Reparto Chacón, 5km east of Nueva Gerona, this striking prison was built between 1926 and 1931, during the repressive regime of Gerardo Machado. The four six-story and rather scary-looking yellow circular blocks were modeled after those of a notorious penitentiary in Joliet, Illinois, and could hold 5000 prisoners at a time.
During WWII, assorted enemy nationals who happened to find themselves in Cuba (including 350 Japanese, 50 Germans and 25 Italians) were interned in the two rectangular blocks at the north end of the complex.
The Presidio's most famous inmates, however, were Fidel Castro and the other Moncada rebels, who were imprisoned here from October 1953 to May 1955. They were held separately from the other prisoners, in the hospital building at the south end of the complex.
In 1967 the prison was closed and the section where Castro stayed was converted into a museum. There is one room dedicated to the history of the prison and another focusing on the lives of the Moncada prisoners. Admission to the now skeletal circular blocks (the most moving part of the experience) is free.