It is the utmost military engineering construction built by the Spanish Crown in America.
Its first stage appeared in 1656 when the so called Bonete, a triangular structure at the highest point was built. After several attacks by the Baron of Pointis, (with some reinforcements), but most of all after Vernon's assault in 1741, under the direction of engineer Antonio de Arevalo, the collateral batteries were built, making of it a true inexpugnable fortress.