Fort San Carlos is a historic military fortification located in Florida. Built in the 18th century, it was constructed by the Spanish to protect their territory from British expansion and other threats. The fort played a significant role during various conflicts, including the American Revolutionary War. Today, Fort San Carlos is recognized for its historical importance and is often studied for its architectural design and strategic location. Visitors can explore the remnants of the fort and learn about its role in the colonial history of North America.