The Vatican Necropolis

Beneath St Peter's floor runs the most consequential excavation in Christendom: the Scavi tours descend into the Roman necropolis over which Constantine raised his basilica - an intact street of pagan and early-Christian mausoleums, frescoed and mosaic-floored, sloping toward the aedicula memorial that second-century Christians raised over what they held to be Peter's grave, the spot the altar has crowned ever since. Access is deliberately scarce: small groups by advance application to the Scavi Office, guided through the warm, close passages to the graffiti wall and the relic niche. It is ninety minutes of vertical time-travel, ending directly under the dome's axis.

History

Roman law forbade burial inside the city, so a cemetery grew up on the southern slope of Vatican Hill beside the Via Cornelia and the Circus of Caligula, whose Egyptian obelisk Domenico Fontana moved in 1586 for Pope Sixtus V to today's St Peter's Square. Tradition holds that Saint Peter, martyred in 64 or 67 under Nero near the circus, was buried here, and the cemetery was still in use when Constantine began the first basilica, as a coin of 318 found in an urn shows; to make a level site over the apostle's supposed grave he filled the necropolis with soil and rubble, sparing only the tomb itself. Excavations sponsored by the Vatican in 1940-1949 uncovered parts of this open-air cemetery, with tombs of the 1st to 4th centuries, among them the Tomb of the Julii, 5 to 12 metres below the basilica (Wikipedia, Vatican Necropolis).

What to look for

• The mausoleum street - frescoed Roman tombs in file.
• The aedicula memorial - the second-century marker under the altar.
• The graffiti wall - pilgrim scratches naming Peter.
• The axis moment - standing beneath dome, altar and grave aligned.

When to go

Year round by application - write to the Scavi Office months ahead; the quota is tiny and the confirmation its own small miracle.

What to expect

The passages run warm, close and stair-laced - claustrophobia and mobility limits should weigh honestly; photography is prohibited throughout and the rule absolute.

Nearby

The basilica above, the crypt's papal tombs and the square.

Key facts