Breathtaking? Yes. We toured both El Morro and San Christobal forts located at the leading edge of the port of San Juan, Puerto Rico. These forts were poised to protect the port/city from invasions from Pirates and (ahem, yes...) Americans among other long-ago conquerers. I was particularly taken with the turrets and wall structures pictured here against the sea.
This shows one of the Devil's Sentry Boxes - click to read the story about the legend...