Castillo San Felipe del Morro, commonly known as El Morro, is a historic fortress located in San Juan, Puerto Rico. Built by the Spanish in the 16th century, it was designed to protect the entrance to San Juan Bay from naval attacks. The castle features thick stone walls, a lighthouse, and stunning views of the ocean. Today, El Morro is part of the San Juan National Historic Site and is a UNESCO World Heritage Site. Visitors can explore its ramparts, learn about its history, and enjoy the scenic landscape surrounding the fortress. It remains a symbol of Puerto Rico's colonial past.