Fort Matanzas National Monument, Spanish colonial fort in Florida, United States.
Fort Matanzas is a Spanish defensive structure built from coquina shells on a small island at the Matanzas River inlet. The tower houses cannons and provides viewpoints to oversee the river and surrounding coastal landscape.
Spanish soldiers built this defensive structure in 1742 to protect the southern water route to Saint Augustine. The fort arose as a response to military threats from the north during the era of European colonial rule.
The name Matanzas comes from the Spanish word for slaughters, referring to the 1565 killing of Jean Ribault and his band of Huguenot Frenchmen, the last of the Fort Caroline colonists, on the inlet's north shore. The fort was built by convicts, slaves, and troops from Cuba. Today, rangers in period uniforms demonstrate cannon firing.
The monument is only accessible by ferry from the mainland visitor center, with boats departing several times daily. The crossing is brief, but weather conditions on the water can shift quickly, so visitors should come prepared for changing circumstances.
The fort stands on Rattlesnake Island, where the marshy ground was stabilized with a foundation of pine pilings before construction. The Spanish sited it there because the position commanded Matanzas Inlet, then less than half a mile away, so all five guns could reach the channel.
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