In a previous post, I described touring Fort Matanzas, which protected St. Augustine’s back door. However, no visit to St. Augustine is complete without touring Castillo de San Marcos. Built over 450 years ago by the Spaniards, the Castillo is the oldest stone fortification in the US.

The Spanish Period

The 20-acre fort, with 30-foot high coquina walls, fronts Matanzas Bay just north of St. Augustine’s city center. Although Pedro Menendez de Aviles founded the city in 1565, construction didn’t begin until over a century later in 1672. Fortunately, construction finished just in time to protect the city from future attacks.