Historic for the role it played during the attempts of foreign conquests, Fort de San Felipe del Morro or simply the El Morro is a citadel so iconic in the Puerto Rican history. The fort was built during the 16th century by the Spaniards to protect the territory from invaders arriving from the sea. Fort de San Felipe del Morro is a vision sitting on top of a high promontory where it went through English and Dutch attacks. The Fort de San Felipe del Morro is considered as one of the biggest citadels ever built in the Caribbean, taking nearly 250 years to complete. Along with the fort’s rich history, it also features fortified walls, lighthouse and an artillery fire control station built by the American government. In 1983, United Nations declared the fort as a National Heritage Site. The Fort de San Felipe del Morro is open between 9am to 6pm, except during important holidays.