Largest masonry fort in the Americas. Ferry or seaplane only. 84,000 visitors.
Seventy miles west of Key West, accessible only by ferry or seaplane. Fort Jefferson — the largest masonry structure in the Americas — rises from a tiny island surrounded by some of the clearest water in the Western Hemisphere. The snorkeling is otherworldly: sea turtles, nurse sharks, and coral formations in water so blue it looks photoshopped. About 84,000 people visit per year. The remoteness isn't a bug — it's the entire point.

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