Fort San Carlos

Fort San Carlos is a timber fortification built in 1816 on a strategic bluff overlooking the junction of two rivers on Amelia Island. The ruins sit within Fernandina Plaza Historic State Park, where visitors can see the remains of wooden defensive structures and earthwork embankments.

Spanish forces built the fort in 1816 as their final major defense installation in Florida during their declining colonial presence. The structure remained significant until Spain ceded the entire territory to the United States in 1821.

The site marks a crossroads where multiple nations competed for control of this strategic coastal location. Visitors walking through the grounds can sense the layered history beneath their feet.

The site is best explored on foot since the remains are scattered across the northern tip of Amelia Island near the historic downtown area. Visitors should expect to see mostly foundations and earthwork ridges rather than standing structures, as much of the original fort has eroded over time.

Archaeological investigations have revealed that two-thirds of the original fort structure has vanished due to coastal bluff erosion over the past two centuries. This makes the site a striking example of how nature can reclaim military fortifications built by human hands.