There is an old fort on an island in the Dry Tortugas (islands off
Florida) called, I believe, Fort Jefferson.  The fort takes up basically
the whole little island.  The only way to get there is by boat or
sea plane.  The fort was turned into a prison and was a pretty grim
place.  This is where Dr. Mudd, who set John Wilkes Booth's leg after
Booth assassinated President Lincoln, was incarcerated.  The fort is
open to the public as a park run by the US National Park Service.
You can go out there and take a self-guided tour of the fort/prison (there
are various explanatory panels around the fort.)  It is quite an eerie
place.

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