Castillo San Cristobal took more than a century to construct and was built to protect San Juan, Puerto Rico from land attack. According to the National Park Service, it is the biggest European fortification in the Americas. – photos by Joe Alexander
Castillo San Cristobal took more than a century to construct and was built to protect San Juan, Puerto Rico from land attack. According to the National Park Service, it is the biggest European fortification in the Americas. – photos by Joe Alexander