In the Gulf of Mexico west of Key West lie small islands called the Dry Tortugas, "dry" because they have no source of fresh water but rain. On one of them, the US built a fortress beginning in 1846, called Fort Jefferson. The Dry Tortugas are now a national park which can only be reached by boat or plane. See the link under "For Curious Minds" to learn more. This photo is looking through a series of arches under the heavy fortress walls.
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