In 1788, the surviving tower core was given a neoclassical restoration, including a new fourth story. The restoration was undertaken by naval engineer Eustaquio Giannini during the reign of Charles III of Spain, and was finished in 1791. UNESCO praised the work: "The Tower of Hercules was restored in the 18th century in an exemplary manner, which has protected the central core of the original Roman monument while restoring its technical functions". Within, the much-repaired Roman and medieval masonry may be inspected.