Category: United States

St. Augustine was founded in 1565 by the Spanish conquistador, Pedro Menendez de Aviles.  Nearly 100 years later, construction began on the fort.  Coquina stones for the fort were gathered from present day Anastasia State Park.  Castillo de San Marcos is one of the only two fortifications in the world built out of this semi-rare form of limestone.  The other coquina fortification is Fort Matanzas, found about 14 miles south.

Typically, when a cannonball hits an object it create a significant amount of damage.  This unique stone has the ability to absorb mechanical stress causing it to essentially swallow the cannonball!

When Britain gained control of Florida in 1763, St. Augustine became the capital of the British East Florida and the fort was renamed Fort St. Mark.  Twenty years later, the territory was transferred back to the Spanish and the fort’s original name was restored.

Not only was the fort used as a stronghold during the 1600s and 1700s, it was also used as an army base (for the US) named Fort Marion  in the 1800s.  The fort became a National Monument in 1924.  It saw 251 of continuous military possession before it was deactivated in 1933.  In 1942, Congress reenacted the fort’s original name, Castillo de San Marcos.

The fort saw its fair share of dark days.  For starters, some slave labor was used to construct the stone fort.  In addition, the fort was attacked several times, and was besieged twiced.  The fort was also used as a military prison to imprison Native Americans (including the famous war chief Osceola).