"It’s inevitable you’ll come across Castillo de San Marcos if you visit St. Augustine: It’s that massive star-shaped stone fortress along San Marco Avenue, just as you approach the historic quarter from the north. The campus of this national monument forms one end of a riverside promenade that stretches south beyond the Bridge of Lions and is populated by dog walkers, morning walkers, and camera-toting tourists. The fortress—the oldest masonry fort in the continental United States—is impressive enough from the outside, but well worth venturing into if you’re a history buff." - Sam Worley
