Rome Underground Temples Tour: Crucifixion Relics & San Clemente

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Free cancellationExcellent qualityLikely to sell out

1/18

Duration2h 30m–3h 30m

GroupUp to 10

LanguagesEN · DE +4

Mobile ticketAccepted

Descend beneath the Colosseum to touch an underground river and walk where early Christians worshipped in hiding.

This walking tour of Rome takes you through the Basilica of San Clemente, where you descend three layers underground to see a preserved Temple of Mithras and touch the river flowing below the city streets, then visit four churches—the Basilica of St. John Lateran, the Holy Stairs, and the Basilica of the Holy Cross in Jerusalem—to see original Crucifixion relics including a nail from the cross, wood of the cross itself, and thorns from the crown of thorns. A live guide in your chosen language leads groups of no more than ten people; entrance fees and headsets are included. The itinerary adapts if any church areas close, keeping the overall duration the same. Dress code requires knees and shoulders covered; moderate walking fitness is needed, and the tour is not wheelchair-accessible.

2h 30m–3h 30m

Step-by-step itinerary

Explore underground temples and churches

Visit underground St. Clement's Basilica
See Temple of Mithras and underground river
Walk to Basilica of St. John Lateran
Learn about Emperor Constantine and early Christianity
Visit the Holy Stairs
Explore Basilica of the Holy Cross in Jerusalem
See Crucifixion relics and nativity fragments
Optionally visit Basilica of Saint Mary Major

The Experience

What makes San Clemente different from other Rome churches is what lies beneath it. You descend through three distinct layers—a medieval basilica on top, a fourth-century Christian church in the middle, and a first-century Roman house with a Temple of Mithras at the bottom. Your guide walks you through the progression from pagan worship to early Christian practice, showing you mosaics that survived centuries underground and letting you touch the actual underground river that still flows beneath the Colosseum. The group stays small, capped at ten people, so you're not navigating tight underground passages in a crowd.

From there you walk to the Basilica of St. John Lateran, Rome's cathedral, to learn why it's called the "Mother and head of all churches on Earth" and hear how Emperor Constantine's decision to legalize Christianity in 313 changed everything. The golden interior and ancient frescoes frame the story of the early persecutions and the martyrs who came before that shift. Then you climb the Holy Stairs—the actual stone steps Jesus walked at his trial in Jerusalem, brought to Rome by St. Helena, Constantine's mother, after her pilgrimage to the Holy Land. You finish at the Basilica of the Holy Cross in Jerusalem, built with soil brought from Jerusalem itself, where the relics are kept: a nail from the Crucifixion, the wood of the cross, the board Pontius Pilate placed above it, thorns from the crown of thorns, and fragments from the cave of the nativity in Bethlehem.

Your guide speaks English, Spanish, Portuguese, Italian, or one of two other languages, and headsets let you hear clearly even in echoing stone spaces. The tour runs 2.5 to 3.5 hours depending on which version you book—some options include a fifth church, the Basilica of Saint Mary Major, with its mosaics and additional sacred relics. If any church area is closed on the day you visit, your guide adapts the route to alternative sites without changing the total time. Wear comfortable walking shoes and clothes that cover your knees and shoulders; public transportation stops are nearby if you need them.

What’s included

Live professional guide in your chosen language.
entrance fees to all churches and the underground sections of San Clemente.
headsets so you can hear your guide clearly in echoing spaces.
groups limited to a maximum of ten people.

Good to know

Moderate physical levelInfant seats availablePublic transport nearby

Operated by TOURIKS

Is this one for you?Book the shared option if you're comfortable exploring with other travelers and want the lower price; choose private if you prefer the guide's full attention and the flexibility to linger at any stop. Either way, the small group size—never more than ten—means you're not jostling through tight underground passages or crowded basilicas with dozens of others.