At a Glance
| Name | Passetto di Borgo (or Corridore di Borgo) |
|---|---|
| Length | approximately 800 m |
| Construction | 1277, Pope Nicholas III |
| Height | 15–20 m above ground level |
| Most famous escape | Clement VII, 6 May 1527 |
| Visiting | special openings (check calendar) |
What is the Passetto di Borgo
The Passetto di Borgo — also known as the Corridore di Borgo — is an elevated walkway approximately 800 metres long that directly connected the Vatican palaces to Castel Sant'Angelo. It runs at height along the Leonine Walls, the same walls built by Leo IV in 846 to protect the papal borough from Saracen attacks.
The corridor is not an underground structure, despite the "secret" label it is often given in popular culture. It is a practicable elevated walkway, protected by a crenellated parapet with archer's loopholes, running the full length of the walls from gate to gate. From below, in the Borgo district, it is still visible as an elevated masonry structure winding parallel to Via della Conciliazione.
Construction: Nicholas III (1277)
The initiative to connect the Vatican to the Tiber fortress goes back to Pope Nicholas III, who in 1277 had the first version of the corridor built. The motivation was clearly defensive: in an age of violent struggles between Roman noble families and permanent political instability, the pope needed a guaranteed escape route to the city's most solid military structure.
In the following decades and centuries the corridor was reinforced, widened and equipped with additional defensive systems. Several towers interrupted it at regular intervals, allowing the passage to be sectioned off in case of attack. The width — approximately 7 metres — allowed a small group of people with armed guards to pass through.
Papal escapes
The Passetto was used in emergency circumstances by several popes:
Alexander VI (1494) — As Charles VIII of France advanced on Rome, the pope took refuge in Castel Sant'Angelo through the corridor. The threat was resolved diplomatically, but the episode confirmed the strategic value of the passageway.
Julius II (1511) — Used the Passetto during the turbulence connected to the crisis of the Council of Pisa.
Clement VII (6 May 1527) — The most famous and dramatic escape. In the early hours of 6 May, the troops of Charles V — German and Spanish Landsknechts — were breaking through the city gates. It was the Sack of Rome.
The Sack of Rome, 1527
6 May 1527 is one of the darkest dates in Roman history. The imperial troops of Charles V, composed largely of Lutheran Landsknechts who had gone unpaid for months, descended on Rome in one of the most systematic acts of violence the city had ever endured.
At the first news of the invasion, the chamberlain grabbed the pope by the mantle and literally pushed him towards the Passetto. Clement VII ran through the corridor at speed, still in ceremonial dress, while the Swiss Guards fought and died at the gates of St Peter's to buy time. Of the 189 soldiers of the Swiss Guard that day, 147 fell — a sacrifice still commemorated on 6 May with the swearing-in of new recruits.
The pope remained besieged in Castel Sant'Angelo for almost six months. From the terrace he could watch the fires consuming the districts of Rome while enemy troops occupied the Vatican. He descended only after signing a humiliating surrender and paying a ransom of 400,000 ducats.
Architecture and structure
The Passetto is built on or alongside the Leonine Walls. The passageway includes:
- Wall-walk: approximately 7 m wide, passable on foot or horseback with a small detachment
- Battlements and loopholes: protection for archers along the entire perimeter
- Control towers: placed at regular intervals to section and defend the corridor
- Controlled gateways: access points that could be sealed quickly in an emergency
- Bas-reliefs and papal coats of arms: visible on several sections, evidence of subsequent restoration work
The structure reaches heights of 15–20 metres above street level in the Borgo in places, making it impossible to scale without specialist equipment.
The Passetto today: how to visit
The Passetto di Borgo is not permanently open to the public: it forms part of the Castel Sant'Angelo National Museum complex but is usually accessible only on special opening days, cultural events and guided tours organised periodically by the management body.
To attend a Passetto visit:
- Check the events calendar at coopculture.it (official operator)
- During some editions of the Heritage Days (September) access is facilitated
- Some cultural tourism agencies offer private guided tours with advance booking
Even without entering the walkway, the Passetto is fully visible from outside: from Via della Conciliazione and the streets of Borgo Pio, the elevated structure can be seen in its entirety, with its battlements and watchtowers clearly distinguishable.
Visit with a private driver
Reach Castel Sant'Angelo and the Passetto di Borgo in comfort. The corridor is visible while strolling between the Vatican and the castle. Service from €49. → Book at myromedriver.com
Frequently Asked Questions
Can the Passetto be visited from inside? Only on special opening occasions or organised guided tours. Check the calendar at coopculture.it.
Is it visible from outside? Yes, the elevated structure is clearly visible from Via della Conciliazione and the streets of the Borgo.
How long is the Passetto? Approximately 800 metres, from the Porta San Pellegrino in the Vatican to the towers of Castel Sant'Angelo.
Article no. 108 — TIER S — MON-06 Castel Sant'Angelo Type: HISTORICAL Words: ~950