Fort San Felipe del Morro or El Castillo San Felipe del Morro in Spanish? is a sixteenth-century citadel which lies on the northwestern-most point of the islet of San Juan, Puerto Rico. Named in honor of King Philip II of Spain, the fort, also referred to as "El Morro" or "promontory", was designed to guard the entrance to San Juan bay, and defend the city of San Juan from seaborne enemies...In 1983, the fort was declared a World Heritage Site by the United Nations and is part of San Juan National Historic Site. Over two million visitors a year explore the windswept ramparts and passageways making the fort one of Puerto Rico's main visitor attractions.