Castillo de San Marcos National Monument Castillo de ... These forts were designed with bastions at the corner of each wall. These spots protected “dead zones” of the fort and allowed firing ...

Built between 1672 and 1695 by the Spanish, The Castillo de San Marcos served as a fort for more than 205 years. It's the oldest masonry fortification in the U.S. What is now a picturesque ...