El Morro, officially known as Castillo San Felipe del Morro, is a historic fortress in San Juan, Puerto Rico, overlooking the Atlantic Ocean. Built by the Spanish between the 16th and 18th centuries to defend against seaborne attacks, it is a UNESCO World Heritage Site and part of the San Juan National Historic Site.
On this postcard: Spanish engineers first added a lighthouse to El Morro in 1846 to guide ships safely into and out of San Juan harbor. However, the current tower was built by American military engineers and rises 51 feet above the sixth level of El Morro. Its lamp is 182 feet above sea-level and still serves shipping every night.
