Castillo de San Marcos National Monument
St. Augustine, Florida
5 Image HDR
The oldest masonry fort and 21st oldest man made structure in the Continental United States the construction of Castillo de San Marcos began in 1672 and was completed in 1695. Considered to be the best preserved example of a Spanish colonial fortification the United States the fort sits along the waterfront near the downtown of the nations oldest surviving European settlement St. Augustine.
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