A journey through time beneath a church

The Basilica di San Clemente is one of Rome's most fascinating churches, because it packs three thousand years of history into a single building. Descend below the medieval church and you cross, level by level, an early Christian basilica and then, deeper still, 1st-century Roman buildings with a temple of Mithras. It's literally a journey through time, from the early Middle Ages all the way back to pagan Rome.

It stands between the Colosseum and San Giovanni in Laterano, just minutes on foot from the Flavian Amphitheatre, and it's run by the Irish Dominican fathers. Despite its extraordinary riches, it remains a relatively quiet stop: one of Rome's great surprises.

The three levels at a glance

  • Upper level — the 12th-century medieval basilica, with its famous golden apse mosaic and Cosmatesque floor.
  • Intermediate level — the 4th-century early Christian basilica, with ancient frescoes.
  • Lower level — the 1st-century Roman buildings, with a Mithraeum and the sound of an ancient spring.

We explore the descent in detail in our guide to the levels of San Clemente.

The golden mosaic

The masterpiece of the upper basilica is its 12th-century apse mosaic: the Triumph of the Cross, an explosion of gold in which the cross is depicted as a Tree of Life sending out tendrils, animals, and figures. It's one of the most beautiful medieval mosaics in Rome, best admired at leisure (binoculars help you catch the details).

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What you pay for and what you don't

The upper basilica (with the mosaic) has free entry, like all churches in Rome. The descent to the underground excavations (the early Christian basilica and the Roman level with the Mithraeum) requires a ticket. You'll find the details in our guide to San Clemente tickets and hours.

How much time you need

The upper basilica alone takes just 15-20 minutes; add the descent to the excavations and plan on about 45 minutes to 1 hour. It pairs perfectly with the Colosseum (just minutes away) and San Giovanni in Laterano, for an itinerary through ancient and Christian Rome.

Frequently asked questions

What is the Basilica di San Clemente? It's a church in Rome famous for its three stacked archaeological levels: the medieval basilica (with a golden mosaic), a 4th-century early Christian basilica, and, below that, 1st-century Roman buildings with a temple of Mithras.

Why does San Clemente have three levels? Because over the centuries one layer was built on top of another: the Roman buildings were absorbed into the early Christian basilica, on which the medieval one was raised. Excavations have brought every level back to light.

Is there a fee to enter San Clemente? The upper basilica (with the mosaic) is free. The descent to the underground excavations (the early Christian and Roman levels with the Mithraeum) requires a ticket.

How much time do you need for the visit? 15-20 minutes for the upper basilica alone; about 45 minutes to 1 hour with the descent to the excavations.

Is San Clemente close to the Colosseum? Yes, it's just minutes on foot from the Colosseum, along Via Labicana, on the way to San Giovanni in Laterano.

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Article #332 · Category: Monuments · Updated: May 2026