El Morro Castle, or El Castillo Del Morro, is an old fort that lies on the northernmost point of San Juan, Puerto Rico. For many years, it guarded the entrance to San Juan bay, and defended the city from seaborne enemies. El Morro, which means "promontory", was declared a World Heritage Site by the United Nations in 1983.
Today, El Morro Castle is one of Puerto Rico's main touristic sites and museums, displaying some of the artifacts that Spaniards, Indians and Africans of that time used and other exhibits, such as ship models of those times and rooms with written descriptions of what happened then.