Anyone arriving in Naples by sea sees it first: five towers of grey piperno planted on the harbour, compact and grim. Castel Nuovo, which everyone in the city calls the Maschio Angioino, looks like nothing more than a fortress, yet inside it hides a Renaissance triumphal arch, the remains of a Giotto cycle and a Roman necropolis under the floor.
For ten euros you also step under a star vault twenty-eight metres high, in a hall named after a group of barons arrested at a wedding feast, where the city council met until 2006.
Make a note of one thing, though: Castel Nuovo is closed on Sundays. The other great Neapolitan museums, when they close, do so on Wednesdays, which is why the castle’s Sunday is easy to forget: if you have a weekend in Naples, put it on the Saturday.
And what lies under the glass floor of the Armoury, with nothing medieval about it?
Alfonso’s arch, which has nothing to do with the castle containing it
In the photograph above, the clash is plain to see. The castle is Angevin, French, Gothic, built of piperno, the dark grey volcanic stone of the Phlegraean Fields. Between two of its towers somebody has wedged a triumphal arch of white marble, two storeys high, that looks cut out of a Roman forum and propped there.
Why are two such different buildings one inside the other? Because the same person did not want them, and nearly two centuries separate them. The castle was founded by Charles I of Anjou in 1279. The arch was commissioned by Alfonso I of Aragon to celebrate his own victorious entry into the city, and it was built between 1453 and 1468 by Guillem Sagrera and a team of Italian and Catalan artists. The attribution of the individual figures is still debated, so be wary of guides who assign them all with confidence.
The political meaning can be read with the naked eye. An Aragonese king installs himself in a French fortress and, instead of demolishing it, stitches a piece of Roman antiquity onto it. The message is that the new master descends not from the Angevins but directly from the emperors. It is one of the first great manifestos of the Renaissance in the south, and it is a piece of propaganda in carved marble.
On the main frieze look for the triumphal procession with Alfonso on his chariot, and higher up the figures of the Virtues in their niches. The marble, after five centuries of salt air, is what it is: look at it in the morning, when the light comes from the east and the reliefs still have shadow.
The Hall of the Barons, and the wedding feast that ended badly
Why does the finest hall in the castle carry the name of a group of defeated noblemen? Because it is the room in which they were seized, and the way it happened belongs in a novel.
In 1486 the barons of the kingdom were conspiring against Ferrante I of Aragon. The king, who knew about it, invited them to the castle for a wedding feast, the marriage of a niece of his to the son of the Count of Sarno, presenting it as a gesture of reconciliation. They came, they ate, and during the evening they were all arrested. Many were sentenced to death. The hall has been called this ever since.
Look up, because the vault is the real reason to come in. It was designed by Guillem Sagrera, from Majorca, the same man who directed the arch, and he built it as a cube covered by a ribbed vault that draws a star and opens at the centre into an oculus. It rises twenty-eight metres, and it is carried by sixteen ribs of Pozzuoli piperno that print a dark grey pattern on the yellow tufa. The contrast of colour is no accident: Sagrera uses the local stone as a drawing.
The hall, moreover, is far less of a museum piece than it looks. Naples city council met in here until 2006, then moved to its institutional seat on via Verdi. And it comes back: whenever the council chamber is unusable, for works or after a fire, the city puts the chairs back under Sagrera’s vault and passes its resolutions there. You may well find the hall closed for exactly that reason.
What is really left of Giotto in the Palatine Chapel
Two opposite exaggerations circulate about Giotto here. It is not true that you can see a Giotto cycle in the Palatine Chapel, and it is not true either that nothing of Giotto is left.
The Palatine Chapel is the oldest surviving part of the Angevin castle. Around 1330 Robert of Anjou commissioned from Giotto a cycle which, according to the sources, represented illustrious figures of antiquity and myth: Samson, Hercules, Solomon, Paris, Hector, Achilles, Aeneas, Alexander, Caesar, each with their companions. A secular, classicising programme, remarkable for a fourteenth-century court chapel.
That cycle is lost. What remains are fragments on the splays of the Gothic windows, the angled reveals that carry light into the thickness of the wall. They are decorations and partial figures, and they have to be looked for: if you go in scanning the walls you will not see them. It is the same fate that met the Giotto of Santa Chiara, five minutes from here, and the fact that the greatest painter of the fourteenth century worked extensively in Naples and left us almost nothing but scraps is one of the heaviest losses in Italian art history.
The glass floor of the Armoury, and the necropolis beneath the castle
The Hall of the Armoury has a glass floor, and you walk on it. Under your feet are the remains that excavation brought to light when work was done on the castle, and they do not belong to the Middle Ages.
You can see the pool of a villa of the first century BC, the structures of another villa of the imperial age, and dozens of burials with rings and other ornaments: in late Roman times this stretch of coast was a necropolis. The Angevin castle, which looks like the oldest thing on the seafront, was built over a cemetery a thousand years older, and nobody suspected it until the digging.
It is the kind of layering that repeats all over Naples, from the baths under Santa Chiara to the cisterns of underground Naples. Here, though, you cross it with the soles of your shoes.
Practical information
Details checked on 10 September 2026 on the site of the City of Naples, which owns the castle. Prices and opening times change: check again before you travel.
Tickets. The full ticket costs 10 euros. Residents of Naples and its Metropolitan City pay 6 euros, and under-18s go in free. They are bought at the ticket office by card, or online on the city council portal, biglietti.comune.napoli.it. Warning: there is no third-party skip-the-line to buy elsewhere, and sites selling you one are selling you a guided tour, not admission.
Opening times. The castle opens Monday to Saturday 9:00-18:00, and last admission is at 17:30. Closed on Sundays.
Warning about extraordinary closures. The castle hosts events and has maintenance days: on 7 September 2026, for instance, it stayed shut to the public for works. These are announced on the city council site a few days ahead, so if the Maschio Angioino is the reason for your trip, check the week before.
What the route covers. The Hall of the Armoury with its glass floor, the Palatine Chapel, the Hall of the Barons, the Hall and Loggia of Charles V, the old prisons and the tower.
Getting there. The Municipio metro station (lines 1 and 6) comes out practically at the foot of the castle, and it is worth a look: it is one of the art stations, and the finds made during its excavation are displayed inside the station itself. The Royal Palace is five minutes away on foot.
Contacts. The Museo Civico answers on 081 7957703 from Monday to Friday 9:00-15:00, or write to beni.culturali@comune.napoli.it.
How long it takes. An hour for the museum route. An hour and a half if you really stop under the vault of the Hall of the Barons and on the glass floor.
The rest of Naples
Castel Nuovo and the Royal Palace are five minutes apart and can be done in the same half day, but watch out: one closes on Sunday and the other on Wednesday, so there is no day on which you will find both shut, as long as you know which to take when. The full picture is in what to see in Naples in 2 days.
If you want to see what this castle looked like when Alfonso’s arch was new, go up to the Certosa di San Martino and find the Tavola Strozzi: it dates from 1472, shows Naples from the sea, and the Maschio Angioino is painted into it, with the water reaching far closer to it than it does today.
From the castle, walking up via Medina, a quarter of an hour brings you into the Greco-Roman grid: there you will find the majolica cloister of Santa Chiara, the Sansevero Chapel, the Caravaggio of the Pio Monte, the cathedral with the treasure of San Gennaro and the entrance to underground Naples.
Photo credits: façade with Alfonso’s arch by Marie-Lan Nguyen (CC BY 2.5); vault of the Hall of the Barons by Sergioizzo and view towards the port by Richard Nevell (both CC BY-SA 4.0). All from Wikimedia Commons.
