The Castillo de 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 fortress features thick walls, a lighthouse, and stunning views of the ocean. Today, El Morro is a UNESCO World Heritage Site and a popular tourist destination. Visitors can explore its well-preserved structures, learn about its history, and enjoy the surrounding park area. The site reflects the military architecture of the Spanish colonial period.