Castillo San Felipe del Morro, also known as El Morro, is a fort that was built in San Juan in the 16th century when Puerto Rico was under Spanish rule.
A trip to San Juan isn’t complete without visiting this iconic structure. Castillo San Felipe del Morro is named in honor of King Philip II of Spain. The fort was designed to guard the entrance to the San Juan Bay, and defend the Spanish colonial port city of San Juan from enemy ships.
In 1898, as a result of the Spanish-American War, the island changed hands from Spain to the United States. El Morro was designated as part of Fort Brooke and actively used as a military installation during the First and Second World Wars.
In 1961, the US Army retired El Morro, passing it on to the National Park Service to establish as a museum. And in 1983, El Morro and the walled-city of Old San Juan were declared Unesco World Heritage Sites.
The Gate of San Juan The main entrance of Old San Juan when it was entirely walled in is a giant doorway carved right into the city wall. From there you can head right to Paseo del Morro or left to Paseo de La Princesa.