In 1917, the ground beneath the Rome-Naples railway line near Porta Maggiore collapsed, revealing a perfectly preserved underground basilica nobody knew existed. Three naves, an apse, white stucco reliefs depicting Sappho, Orpheus, and mythological scenes — a complete liturgical space carved 7 meters below ground level, probably by a Neopythagorean sect in the 1st century AD. It had been sealed — deliberately — around 50 AD and never entered again. For 1,867 years, this building sat in complete darkness beneath one of Rome's busiest streets. The stucco reliefs, protected from air and light, survived in extraordinary condition. Rome guide → · Hidden Rome →
Plan my Rome trip →The monumental gate itself (52 AD, Emperor Claudius) is worth seeing. Built as an aqueduct intersection — two aqueducts (Aqua Claudia and Anio Novus) crossed above the road here, and Claudius turned the crossing into a grand double-arched gateway. The travertine is rusticated (deliberately rough-finished), giving it a muscular quality that differs from polished marble architecture. The tomb of the baker (Sepolcro di Eurisace) sits just outside — a freedman baker who made his fortune supplying bread to Rome built his tomb in the shape of grain-measuring vessels. It's bizarre, touching, and unique.
The basilica is 12m long, 9m wide, with three naves separated by six pillars. The apse at the end has a stucco relief depicting Sappho leaping from the Leucadian Rock (a suicide that was also a divine transformation). Other reliefs show Orpheus, Ganymede, landscapes, and ritual scenes. Who built it? The leading theory: Titus Statilius Taurus, a senator connected to mystical cults, who was accused of practicing magic and forced to commit suicide in 53 AD. The basilica may have been sealed after his death to conceal the evidence.
Visits are by guided tour only — extremely limited (small groups, specific dates). Book through Soprintendenza Speciale di Roma or check coopculture.it for available dates. This is one of the hardest sites to visit in Rome — fewer than 1,000 people see it per year. If you can get a reservation, take it.
Address: Piazzale Labicano (tram 5, 14, or 19 to Porta Maggiore. Metro C: Lodi is the nearest). Porta Maggiore and Baker's Tomb: free, always visible from the street. Underground Basilica: guided tours only, very limited dates, €10-15. Check coopculture.it or Roma Sotterranea events. Duration: 15min for the gate + tomb (free, from outside). 45min guided tour for the basilica. Combine with: San Giovanni in Laterano (10min walk — Rome's actual cathedral), Colosseum (15min walk), Museo Nazionale Romano Palazzo Massimo (10min by tram).