It was constructed on a series of terraces; there were four main levels and three large bulwarks to house the artillery. Supplies would be delivered by sea and then stored in the large warehouse, which was cut directly into the rock, or transported up to the top level which housed the citadel. Construction of the citadel took 62 years, starting in 1638 and finally being completed in 1700, though work on the fortification was spasmodic.
It was constructed on a series of terraces; there were four main levels and three large bulwarks to house the artillery. Supplies would be delivered by sea and then stored in the large warehouse, which was cut directly into the rock, or transported up to the top level where the citadel resided. Construction of the citadel took 62 years, starting in 1638 and finally being completed in 1700, though work on the fortification was spasmodic.