Castillo del Morro, also known as Castillo de San Pedro de la Roca and San Pedro de la Roca Castle, is a fortress situated on the coastline of Santiago de Cuba, Cuba. 10 km southwest of the city center, it guards the bay. The fortress was announced as a World Heritage Site by UNESCO in 1997 and is deemed to be the best-maintained and most complete reminder of Spanish-American military engineering. Battista Antonelli, from a Milanese family of military engineers, designed the structure in the early 1600s on behalf of the governor of the city, Pedro de la Roca de Borja, as a defense against pirate raids. The fort was constructed on a series of terraces, with four main levels and three bulwarks to hold the artillery. Supplies were delivered by sea and stored in a large warehouse cut into the rock, or transported to the upper level which housed the citadel. The citadel took 62 years to build, starting in 1638 and finally being completed in 1700. Some of the structures from the earlier fortification were later included in the main structure.