Castel San Giovanni

High on the ridge between the Pora and Aquila valleys, Castel San Giovanni is the Spanish Crown's fortress above Finalborgo, laid out in the early 1640s by the military engineer Francesco Prestino around an older medieval tower. Demolished in part by the Genoese, then a prison for nearly a century, it was restored and opened to visitors in 2018.

Why it matters

When the Finale passed into the orbit of the Spanish monarchy in the seventeenth century, the Crown fortified the corridor behind the coast, and this fortress — one of the best-preserved Spanish fortifications of the Finalese — stands above Finalborgo as a major part of the coastal defence system. Its angled, pincer-shaped fronts and projecting sentry boxes reflect the development of seventeenth-century military architecture. The building's second life matters just as much: from 1822 the Savoy state ran it as a prison, and the cells, graffiti and fittings of that era survive inside a monument that would otherwise read as purely martial. The site preserves evidence of its military, prison and museum histories.

What to notice

The plan is built around a medieval pentagonal tower, absorbed as the central keep — the "maschio" — with a two-storey block holding prison cells at the north entrance and a three-level building on the south side facing the parade ground. The corners have guardiole, or projecting sentry boxes, while the southern front has the tall walls worked "a tenaglia", in pincer form, which gave artillery-age defence its angled faces. Inside, the small chapel and the old kitchen with its masonry hearth show the garrison's daily life, while eighteenth-century inscriptions scratched by prisoners into the slate around the cell doors record the fortress's later use. The Ministry's restoration of 1999 recovered the Spanish-period appearance yet deliberately kept prison-era elements, so both identities remain visible in fabric. The ramparts overlook Finalborgo's rooftops, both valleys and the sea.

Context and history

The fortress was designed by Francesco Prestino, a Lombard military engineer serving the State of Milan. Work began in 1642–43, and the Ministry records its definitive form in 1644. Hundreds of workers were on site daily during construction, and the medieval tower of Becchignolo was swallowed by the new work. Spain reinforced the fortress repeatedly through the seventeenth century. In 1713 the Finalese passed to the Republic of Genoa, and the Genoese removed the artillery and partially demolished the fort to put it beyond military use. After long abandonment it became a prison under the Savoy government from 1822, remaining in that role into the early twentieth century before closure after the First World War. Restoration was completed in 1999, and the site opened to the public in 2018 under the Direzione regionale Musei Nazionali Liguria. It now hosts temporary exhibitions and events.