Morro Castle located in Havana, Cuba, is a historic sea defense fortress built in the late 16th century to protect Havana's harbor from enemies at sea. The full name of the castle is Castillo de los Tres Reyes del Morro, meaning “Castle of the Three Kings of Morro”, and its structure is a magnificent example of Spanish colonial military architecture. The castle houses a museum with a wealth of historical artifacts and defensive installations, including a massive fort and an ancient lighthouse.