One of the most fascinating facts about Castel Sant'Angelo is that it contains a secret escape route for the Pope. Known as the Passetto di Borgo, this 800-metre-long elevated corridor was built in 1277 to connect the castle directly to the Vatican, allowing popes to seek refuge within its fortified walls during times of crisis.
Surprising Facts About Castel Sant'Angelo
From its origins as an emperor's final resting place to its role in opera, this iconic Roman landmark is filled with nearly two millennia of secrets.
- It Was Built as an Emperor's Tomb
Before it was a castle, the structure was commissioned by Emperor Hadrian around 135 AD as a mausoleum for himself and his family. His ashes were placed there in 139 AD, and it served as the imperial tomb for emperors up to Caracalla in 217 AD. - A Vision of an Angel Gave It Its Name
In 590 AD, Rome was suffering from a terrible plague. According to legend, Pope Gregory the Great saw a vision of the Archangel Michael atop the building sheathing his sword, which he interpreted as a sign the plague would end. The fortress was renamed Castel Sant'Angelo (Castle of the Holy Angel) in honour of the event. - It Has a Secret Papal Escape Route
The Passetto di Borgo is a real, fortified passageway connecting the castle to Vatican City. Its most famous use was in 1527, when Pope Clement VII fled through it to escape the mutinous troops of Emperor Charles V during the Sack of Rome. - It Was Once Rome's Tallest Building
When it was completed, Hadrian's Mausoleum, with its cypress-topped mound and bronze chariot statue, was the tallest building in Rome. - The Angel Statue Has Been Replaced Multiple Times
The current bronze statue of the Archangel Michael, created by Peter Anton von Verschaffelt, was installed in 1753. It replaced an earlier marble statue from the 16th century. Earlier versions, including one made of wood, were destroyed over the centuries. - It Served as a Notorious Prison
For centuries, the popes used parts of the castle as a prison for high-value detainees. Famous inmates included the artist and sculptor Benvenuto Cellini (who famously escaped), the philosopher Giordano Bruno, and the alchemist Cagliostro. - Defenders Once Hurled Statues at Attackers
During the siege of Rome in 537 AD by the Goths, the defending soldiers ran out of projectiles. As recounted by the historian Procopius, they resorted to breaking the mausoleum's decorative bronze and stone statues and throwing the pieces down on the attackers. - It is the Setting for a Famous Opera's Finale
The tragic third act of Giacomo Puccini's opera Tosca (1900) is set at Castel Sant'Angelo. The heroine, Floria Tosca, leaps to her death from the castle's ramparts in the dramatic conclusion. - The Original Roman Ramp is Still in Use
Visitors today enter the heart of the castle via the original helical ramp built in the 2nd century. This impressive spiral ramp ascends through the core of the ancient mausoleum, leading to what was once the chamber of the imperial urns. - It Became a Public Museum in 1925
After the unification of Italy, the castle was decommissioned as a fortress in 1901. It was restored and officially opened as the Museo Nazionale di Castel Sant'Angelo in 1925, allowing the public to explore its many layers of history.
These are just a few of the stories held within the walls of this ancient monument. The best way to uncover more is with one of our guided tours, which bring the castle's dramatic past to life.
Frequently asked questions
What is the most interesting fact about Castel Sant'Angelo?
Perhaps the most interesting fact is its complete transformation of purpose. It was designed as a tomb for an emperor, but history converted it into a military fortress, a papal palace, a treasury, a courthouse, a notorious prison, and finally, a national museum.
Is the secret passage from the Vatican real?
Yes, the Passetto di Borgo is a real, 800-metre-long fortified corridor built in 1277 that connects Castel Sant'Angelo with the Vatican. It was designed as an escape route for popes in times of danger.
Was Castel Sant'Angelo ever a prison?
Yes, for centuries the Papal State used Castel Sant'Angelo as a prison. Notable prisoners included Giordano Bruno and Benvenuto Cellini, who documented his imprisonment and dramatic escape in his autobiography.
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