Castel Sant'Angelo — Complete Guide to the Castle
Few buildings in Rome have lived as many lives as Castel Sant'Angelo. What began in 139 AD as an imperial mausoleum for Emperor Hadrian has been, in turn, a Roman fortress, a medieval stronghold, a Renaissance papal residence, a feared prison, a military barracks, and finally a national museum. Its cylindrical core, raised on the right bank of the Tiber just downstream from Saint Peter's, still holds the mass of Hadrian's original tomb beneath later layers of stone.
Visitors today move through six levels connected by a spiral ramp — one of the oldest architectural elements preserved in the building — climbing from the ancient funerary chambers up to the open-air Angel's Terrace, crowned by Peter Anton von Verschaffelt's bronze archangel. On the way, the route passes through the richly frescoed papal apartments of the Borgias and the Farnese, the arms collection, the prisons where Beatrice Cenci and Alessandro Cagliostro were once held, and the ramparts from which the castle was defended during the Sack of Rome in 1527.
Above the city's rooftops, the terrace offers one of the widest and most immediate panoramas of Rome: Saint Peter's dome to the west, the medieval roofline of the Borgo below, and the Tiber curving southward toward the historic center. The available tours range from a self-guided entry with audio app to a small-group guided experience and, in the case of the Passetto di Borgo, access to the 800-metre elevated passageway that once linked the castle to the Vatican.
The Six Levels
The official visitor route, as set by the Direzione Musei Nazionali di Roma, follows a logical ascent from the entrance hall to the terrace. Each level tells a different chapter of the castle's history.
Level 0 — Entrance and the Spiral Ramp
The visit begins in the original Roman entrance hall (Atrio) at the foot of the cylindrical core. From here, a 125-metre spiral ramp rises through the interior — the same passage that once carried Hadrian's funerary procession. The gradient is gentle and the masonry walls still show the Roman brickwork. This level also preserves the Dromos, the straight funerary corridor built to house the emperor's urn.
Level 1 — Hadrian's Burial Chambers
At the top of the spiral ramp sits the Sala delle Urne, the room that originally held the cinerary urns of Hadrian, his wife Vibia Sabina, and several of his successors. The chamber is austere and square, carved into the heart of the Roman mausoleum. Nearby, the Sala del Tesoro (Treasury Room) was used in later centuries to store the Vatican archives and, reportedly, part of the papal gold reserve.
Level 2 — Courtyards, Armoury and Historic Prisons
The second level opens into the Cortile dell'Angelo, an open courtyard that takes its name from the marble angel by Raffaello da Montelupo once placed on top of the castle. Around it are grouped the armoury collection, the small chapel of Leo X, and the historic prisons — narrow cells built into the thickness of the Roman drum. It was in these cells that Beatrice Cenci spent her last months before her execution in 1599, and where Count Alessandro Cagliostro was held in 1789.
Level 3 — The Papal Apartments
The most richly decorated level of the castle. The Sala Paolina, commissioned by Pope Paul III Farnese and frescoed by Perin del Vaga, combines mythological scenes with painted architecture in a trompe-l'œil that still surprises on entry. Adjoining it are the Camera del Perseo and the Camera di Amore e Psiche, both named after their fresco cycles, and the private library (Biblioteca) and chapel used by the popes during their stays. These rooms made the castle, for much of the sixteenth century, a parallel papal residence to the Vatican.
Level 4 — The Angel's Terrace
The highest accessible point of the castle, and for many visitors the reason to climb. The terrace is dominated by the bronze statue of the Archangel Michael sheathing his sword, cast by Peter Anton von Verschaffelt in 1753 — a replacement of the earlier marble angel by Raffaello da Montelupo, now kept indoors. The view spans Saint Peter's Basilica and the Vatican to the west, the Ponte Sant'Angelo with Bernini's angels below, and the historic center of Rome to the south. A small café occupies one corner of the terrace in season.
Bastioni — The Defensive Walls
Below the main core, at ground level, a star-shaped bastion system was added between the fifteenth and seventeenth centuries to adapt the castle to gunpowder warfare. Four corner bastions — San Matteo, San Marco, San Luca and San Giovanni — surround the cylindrical keep. The bastion walk is partially open to visitors and connects, at its northern end, with the entrance to the Passetto di Borgo, the fortified corridor that runs 800 metres to the Vatican Palace.
Recommended Route — The Highlights
A full visit takes two to three hours. Visitors with less time can follow the short route marked on the official map by the Direzione Musei Nazionali di Roma, which highlights the essential rooms. The core sequence is:
- The Spiral Ramp — the Roman access passage that still structures the visit today.
- The Sala delle Urne — Hadrian's original burial chamber at the heart of the mausoleum.
- The Cortile dell'Angelo and the historic prisons — the open courtyard and the cells of Beatrice Cenci and Cagliostro.
- The Sala Paolina — the most spectacular fresco cycle in the castle, by Perin del Vaga.
- The Papal Apartments — the Borgia and Farnese rooms used by popes as a fortified residence.
- The Angel's Terrace — the summit, with Verschaffelt's bronze angel and the panorama over Rome.
- The Passetto di Borgo (when included in the ticket) — the 800-metre escape corridor to the Vatican.
Plan your visit
To make the most of Castel Sant'Angelo, it helps to arrive with a clear plan. Opening hours, ticket options, and the fastest way to reach the entrance are covered in the practical section of this site.