Castillo de San Marcos National Monument, St. Augustine, FL

Altar inside the chapel at Castillio de San Marcos, St. Augustine Florida. Circa 2000-2019 Castillo de San Marcos National Monument, St Augustine, Fl. The Castillo de San Marcos is the oldest masonry fort in the continental United States. Located on the shore of Matanzas Bay in the city of St. Augustine, Florida, construction began in 1672, The Castillo de San Marcos\u27 architecture and detail are distinctive and unique. It is a fort constructed by the Spanish, and built of coquina, a type of shell stone. Shortly after Florida became a territory of the United States, the fort was renamed Fort Marion in honor of Revolutionary War General Francis Marion. It retained that name from 1825 to 1942, when the Castillo appellation was restored. It was used by the US army until 1899. It was made a national monument in 1924, after 251 years of continuous military possession. The fort was deactivated in 1933 and the site was turned over to the United States National Park Service. National Register of Historic Places NRIS #66000062https://digitalcommons.unf.edu/historical_architecture_main/7372/thumbnail.jp