The Baronial Castle of Fondi, also known as Castello Caetani, dominates the main square of the city. Built between the 13th and 15th centuries, it houses the Civic Museum with Roman and medieval artifacts. From its terrace, you can enjoy a spectacular view of the Ausoni Mountains and the plain.
Highlights:
– Admire the 33-meter high keep with its 15th-century cylindrical tower.
– Visit the Civic Museum: Roman pottery and inscriptions.
– Discover the 19th-century prison graffiti in the dungeons.
– Enjoy the view from the terrace, the highest point in Fondi.
Events nearby

The Baronial Castle of Fondi, symbol of the city, tells centuries of history amid Roman walls, the election of an antipope, and the patronage of Giulia Gonzaga. Today it houses the Civic Museum and offers a unique view over the Fondi plain.
- Piazza Giacomo Matteotti, Latina (LT)
- Open in Google Maps
- View on Google Images Castello Baronale di Fondi a Latina
Good to know
Introduction
Historical Overview
- 1st century BC: Roman foundation walls
- 1319: Beginning of castle construction by the Caetani family
- 1378: Election of antipope Clement VII
- 16th century: Residence of Giulia Gonzaga
- 1798: Fire during the French invasion
- 1861-1931: Used as a prison
- 1997: Opening of the Civic Museum
Architecture: A Puzzle of Centuries
The Civic Museum: A Dive into the Past
Why Visit
A museum that moves you: the prisoners’ graffiti leave a mark, more than many works of art.
Living history: walk through the halls where an antipope was decided and where a patroness countess discussed with poets. It’s not just a monument; it’s a stage for history.
When to Visit
Nearby
Itineraries nearby
💡 Did You Know…?
The castle was the scene of memorable events: in 1378 the antipope Clement VII was elected here, earning Fondi the nickname ‘City of Satan’. In the 16th century, the patron Giulia Gonzaga fled through the underground passages to escape the corsair Barbarossa, sent by Sultan Suleiman to kidnap her. To this day, you can see the graffiti left by 19th-century prisoners, silent witnesses of the past.






