• Cannon firing on the gundeck of the Castillo de San Marcos

    Castillo De San Marcos

    National Monument Florida

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    Afternoon Thunderstorms can create dangerous amounts of lightning strikes. If Lightning is visible from the Castillo, Gundeck closures will take place. Click this link for the local weather forcast. More »

Horizontal Surface Repair and Stabilization

Workers from the NPS Historic Preservation Training Center work on the top of the Castillos walls.

Workers from the NPS Historic Preservation Training Center work on the top of the Castillo's walls.

The Castillo de San Marcos has been under assault since its construction started back in 1672. Aside from attacks by cannon and musket fire, the fort has also been battling Florida’s destructive climate, including powerful hurricanes and tornadoes, unrelenting heat and humidity, and corrosive salt air.

In addition, inappropriate repairs have occurred utilizing modern day cements, such as Portland, which are chemically and physically incompatible with the original coquina stone. For these reasons, combined with the 3,500 visitors storming through on a busy day, the Castillo de San Marcos has been steadily deteriorating.

The horizontal surfaces, in particular, have suffered damage to a level that requires immediate attention. Individual coquina stones have disintegrated and mortar joints have failed. This has resulted in the surface becoming irregular and has created 'battle scars' where water collects and vegetation takes hold.

The NPS Historic Preservation Training Center (HPTC), Park staff, NPS Southeast Regional Office, and the State of Florida Historic Preservation Office worked together to draw up a battle plan to stabilize the Castillo, one of our nation’s greatest treasures.

The preservation crew is inspecting all of the coquina which comprises the top level of the inner and outer fort walls. Poor condition stone is being replaced with healthy coquina. In addition, any previous repairs made with modern cements are being carefully removed and replaced with historically accurate lime mortars.

It is important to note that the work is not being preformed to improve the visual appearance of the fort. Coquina stones are only replaced in cases were it is absolutely necessary in order to preserve and protect the Castillo de San Marcos for future generations.

The deteriorated coquina is being replaced by stone taken from a location near where the fort’s original coquina was quarried. In addition, compatible lime mortar is being used for the bedding, pointing, and finishing of the stones.

The project was completed in spring of 2008.

Did You Know?

Spanish gold doubloons still spark treasure hunters to take on bold adventures.

Spanish fleets brought the wealth of the New World to Spain in the form of gold, gems, spices, and exotic goods. In the 300 years of the colonial era it is estimated that they carried between 600-800 billion dollars worth of treasure. Castillo de San Marcos National Monument, Florida