Castillo de San Marcos National Monument on the East Coast of Florida commemorates the fierce clashes between European powers over the spoils of the New World. St. Augustine, Florida, was the northernmost point of a vast Spanish empire that included Mexico, Central America, and parts of South America. The city's location was critical in defending fleets that carried treasure from the Caribbean back to Spain.
In the late 17th century, Spain built Castillo de San Marcos to defend the city against both pirates and British forces. The castle withstood an attack by the English in 1702 that left the rest of St. Augustine burned to the ground. Although the fortress was eventually claimed by England and later America, via treaty, it was never taken by force. Today the bastion's history is told via weapons demonstrations, ranger talks, and detailed museum exhibits.