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Lies on the northwestern-most point of the islet of San Juan, Puerto Rico. Named in honor of King Philip II of Spain, the fortification, also referred to as el Morro or promontory, was designed to guard the entrance to the San Juan Bay, and defend the city of Old San Juan from seaborne enemies. In 1983, during the Reagan Administration, the castillo was declared a World Heritage Site by the United Nations in conjunction with the San Juan National Historic Site.