Crypta Balbi
Discover Crypta Balbi
Last updated on October 6, 2026Introduction
From 9 January 2023 the Crypta Balbi seat is closed to the public for the works connected with the great URBS project, "dalla città alla campagna romana", and Turismo Roma tells visitors to consult the official site for updates. Read what follows as a description of what reopens, not of what you can see this week.
It is the most unusual museum in Rome, and the least visited. A seat of the Museo Nazionale Romano together with Palazzo Massimo, Palazzo Altemps and the Terme di Diocleziano, the Crypta Balbi is an extraordinary example of a museum of urban archaeology, a unique journey into the past of the city unfolding across over 2,000 years of history. Not a collection brought to a building — one building, excavated, and the collection is the building.
It begins with a theatre and a war. Standing between Piazza Venezia and Largo di Torre Argentina, the Crypta proper goes back to the 1st century BC: it was a portico attached to the small and refined theatre built by Lucius Cornelius Balbus in 13 BC with the booty of his victories over the Libyan peoples, and it served as a place of recreation and refreshment for the public during the intervals of the performances.
Then the centuries pile up on top of it. The museum recounts and preserves the traces of the structures, buildings and monuments that followed one another in this area over the centuries: the underground levels with the remains of the theatre and the nearby Porticus Minucia Frumentaria — a great quadriportico intended for the free distributions of grain to the citizens of Rome — then the late-antique lime kiln, then the fortified complexes and medieval houses of the merchants, and finally the seventeenth-century dormitory of the Monastery of Santa Caterina, in which the museum rooms have been made.
Three floors, three questions. The ground floor recounts the archaeology and history of the complex of Balbus and the nearby Porticus. The first floor is dedicated to the most recent archaeological investigations, which brought to light a complex of buildings built against the Crypta after the fire of 80 AD and definitively abandoned in the 7th century AD. The second floor illustrates the transformations from late antiquity to the Middle Ages, with studies of aspects of material and artistic culture; there, the social and cultural changes and the living conditions of the city and its inhabitants are narrated through the objects returned by the investigations or coming from other sites in the city.
Architecture
The building is a stratigraphy, not a design. What the Crypta Balbi presents is the traces of the structures, buildings and monuments that followed one another in this area over the centuries, stacked in place: Roman portico, post-fire insula, lime kiln, merchants' houses, convent dormitory.
The Roman element is a portico. The Crypta proper, of the 1st century BC, was a portico attached to the small and refined theatre built by Lucius Cornelius Balbus in 13 BC, designed as a place of recreation and refreshment for the public during the intervals of the performances — covered circulation space, which is why so much of its masonry survived to be built against.
Its neighbour was vast and public. The Porticus Minucia Frumentaria was a great quadriportico intended for the free distributions of grain to the citizens of Rome.
The museum's own rooms are seventeenth-century conventual. They have been made in the dormitory of the Monastery of Santa Caterina — the plainest architecture on the site, and the reason the visit works: a regular range of rooms to display an irregular excavation.
And the vertical arrangement is the curatorial device. The display is on three levels: ground floor for the complex of Balbus and the nearby Porticus, first floor for the most recent archaeological investigations, second floor for the transformations from late antiquity to the Middle Ages.
How it was built and evolved over time
It was built with the proceeds of a war. Lucius Cornelius Balbus had the small and refined theatre built in 13 BC with the booty of his victories over the Libyan peoples, and the Crypta was a portico attached to it.
Then it was built over, repeatedly, by people who needed the walls. After the fire of 80 AD a complex of buildings was built against the Crypta, standing until it was definitively abandoned in the 7th century AD.
Late antiquity used it as a quarry. The late-antique lime kiln on the site is where worked stone went to be burnt back into mortar.
The Middle Ages fortified and inhabited it. Fortified complexes and medieval houses of the merchants took over the block.
The seventeenth century added the floor you walk on. The dormitory of the Monastery of Santa Caterina, in which the museum rooms have been made.
And archaeology made it legible. The most recent archaeological investigations brought to light a complex of buildings built against the Crypta after the fire of 80 AD — which is the exhibit on the first floor.
Frequently asked questions
Can I visit it? No. From 9 January 2023 the Crypta Balbi seat is closed to the public for the works connected with the URBS project, "dalla città alla campagna romana". Turismo Roma says to consult the official site for updates.
When does it reopen? No date is published.
What are the opening hours? None are published, because the seat is closed.
How much does it cost? No admission price is published — as at every Museo Nazionale Romano branch on Turismo Roma.
Where is it? Via delle Botteghe Oscure 31, between Piazza Venezia and Largo di Torre Argentina.
What is the Crypta Balbi? A seat of the Museo Nazionale Romano together with Palazzo Massimo, Palazzo Altemps and the Terme di Diocleziano, and an extraordinary example of a museum of urban archaeology, a unique journey into the past of the city unfolding across over 2,000 years of history.
What was the Crypta originally? It goes back to the 1st century BC: a portico attached to the small and refined theatre built by Lucius Cornelius Balbus in 13 BC, serving as a place of recreation and refreshment for the public during the intervals of the performances.
How was the theatre paid for? With the booty of Balbus's victories over the Libyan peoples.
What was the Porticus Minucia Frumentaria? A great quadriportico intended for the free distributions of grain to the citizens of Rome, next to the Crypta, and part of the underground levels.
What is on each floor? The ground floor recounts the archaeology and history of the complex of Balbus and the nearby Porticus. The first floor is dedicated to the most recent archaeological investigations, which brought to light a complex of buildings built against the Crypta after the fire of 80 AD and definitively abandoned in the 7th century AD. The second floor illustrates the transformations from late antiquity to the Middle Ages, with studies of aspects of material and artistic culture.
Why are the museum rooms in a convent? Because the block contains the seventeenth-century dormitory of the Monastery of Santa Caterina, in which the museum rooms have been made.
What can I see instead? The other three seats of the same museum: Palazzo Massimo, Palazzo Altemps and the Terme di Diocleziano.