Rome Underground Tour of St Clement’s Basilica: From the Early Underground Church to the Legal Church

The Crucis Rome Underground Tour of San Clemente explores ancient Catholicism via the archaeological excavations of the early Roman church of Pope St Clement (San Clemente), above which stands the basilica of the same name today.

The fourth Bishop of Rome, St Clement, was the leader of the illegal, underground Christian community towards the end of the 1st century AD, though the basilica we see today just a stone’s throw from the Colosseum dates back only to 1100. This majestic church is built on top of the ruins of the original 4th century basilica, converted from a former noble residence when Christianity was legalised in the Roman Empire and many public and private buildings were subsequently converted into churches.

The 4th century basilica, in turn, stands above the remains of Pope St Clement’s home, in which he led covert liturgical ceremonies and congregations for the early Christian community until his arrest, imprisonment and ultimate martyrdom in the stone quarries of Crimea.

Thus your Rome Underground Tour takes us deep down underground to the very beginnings of Christianity in the Roman Empire and then back up through the ages, exploring themes such as solidarity, community and martyrdom and the challenges faced by those brave enough to become part of this revolutionary new religion.

A bite-sized tour of just one hour, the Crucis Rome Underground Tour of St Clement includes the relics of St Clement, St Ignatius of Antioch and Sts Cyril and Methodius and is ideal for those travellers who are less able to manage an arduous walking tour and yet wish to be immersed in the ancient history of Rome.

This Rome underground tour moves up to the magnificent upper Basilica however where your expert Catholic guide will explain the awe-inspiring mosaics for you to discover the fascinating and rich symbolism of the images and their relation to the mystery of suffering.  This tour is an essential tour for any pilgrim visiting Rome wishing to deepen their knowledge, understanding and faith.

Another Crucis tour easier on the legs and is of great interest to pilgrims is our Basilica of St Mary Major Rome Tour, running Mondays, Wednesdays and Fridays from 3.00 to 4.00pm. Contact us to explore package deal options.

Free Cancellation is offered for those who act early.

To learn more about the Catholic faith, visit Crucis.cc.

MEETING POINT Outside the Basilica of St Clement (Piazza di S. Clemente). See the precise location on Google Maps or What3Words.
END POINT As above.
DEPARTURE TIME 11.00am Wednesdays, 9.00am Fridays. Please be at the meeting point 15 minutes before departure.
DURATION Approx. 1 hour.
DRESS CODE Comfortable clothing, covering shoulders and knees.
INCLUDED
Devout Christian guide Entrance tickets
Taxes
NOT INCLUDED
Transport to starting point
Guide tip

Additional information

Ticket TypeAdult (16+), Student ID, Child (under 16)
1

1st Century Home of St Clement (San Clemente)

On entering the Basilica of St Clement we will immediately descend to the lowest part of the excavations, three floors below the 11th century edifice. Here in the cool silence we’ll learn about the life of St Clement, a Jewish-Christian convert and the third Bishop of Rome, consecrated by St Peter himself. At this level we’ll also see the ruins of St Clement’s unlikely neighbour – a temple to the ancient pagan cult of Mithras!
2

4th Century Underground Basilica of St Clement

Some time after the Great Fire of 64AD the derelict building in which St Clement had lived and those around it (including that of the cult of Mithras) were filled in and a public mint was built on top. Though it is also believed that the building was at some point a noble residence, it was later given by the Emperor Constantine to the Church along with numerous other public basilicas, to be consecrated and become places of mass worship for the newly legalised Christian religion.
3

12th Century Basilica of St Clement

We conclude our fascinating Crucis Rome St Clement Tour back up on street-level, where we’ll explore the mosaics and spellbinding artwork in the 12th century basilica. The Basilica of St Clement is owned and maintained by the Irish Dominicans, who are responsible for the excavations that took place in the 1950’s despite much of the early ruins being under the water table.

Outside the Basilica of St Clement, Piazza di S. Clemente, close to the Colosseum and Colosseo Metro.

Rome Underground Tour - Altar of St Clement's Basilica Rome
St Clement's Basilica Station Churches Rome
Rome Underground Tour - Altar of St Clement's Basilica Rome
Ceiling of St Clement's Basilica Rome
19.0045.00
One tour per person

Tour Reviews

5.00 based on 2 reviews
April 19, 2024

I was blown away by the amount of history in this tour down in the 1st century excavations as much as I was by the beauty of the 12th century basilica above. My family and I had a great time and we were stunned how much knowledge the guide had. I highly recommend this exciting tour.

April 25, 2024

Tom’s mastery of Catholic theology continued to shine brightly as we embarked on our subsequent adventures. With each tour, he revealed new layers of insight into Rome’s spiritual heritage, enriching our understanding of its sacred sites and traditions. Whether we were exploring the catacombs beneath the city or tracing the path of the ancient apostles, Tom’s passion for his work illuminated our path, transforming each moment into a profound encounter with history and faith.

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