- nationalparks.org explore/parks/castillo-de-san-…Over 320 years old, the 20-acre site of Castillo de San Marcos stands proud as the oldest and largest masonry fortress within the continental United States.
- ghostcitytours.com st-augustine/haunted-places/…The home of threatening shadow people and headless chiefs, no Florida ghost tour is complete without a visit to the Castillo de San Marcos.
- floridahikes.com castillo-de-san-marcosThe only remaining 17th century fortress in North America, the Castillo de San Marcos defended the Spanish colony of St. Augustine from two British sieges...
- ytur.net gezi-rehberi/florida/castillo-de-san-…Castillo de San Marcos, Amerika Birleşik Devletleri’nin Florida eyaletinde Augustine şehrinde mimarisi ile büyüleyen bir duvar kalesidir.
- softschools.com facts/us_geography/castillo_de_…Castillo de San Marcos is a fort located on Matanzas Bay's western shore, in St. Augustine, Florida.
- Castillo de San Marcos was built to protect Spanish interests in the New World from foreign adversaries like the British and pirates.
- hauntedinamerica.com castillo-de-san-marcos/The fort changed names again and became Fort Marion between 1821 and 1942. His original name “Castillo de San Marcos” was then restored in 1942.
- travelchannel.com shows/ghost-adventures/articles…In the late 1500s, while Castillo de San Marcos was under Spanish command, a French coastal village near modern-day Jacksonville was wiped out.
- thewanders.eu castillo-de-san-marcos/The Castle of San Marco – Castillo de San Marcos in Spanish- is located in the city of St. Augustine ,Florida, in the United States.