Underground basilica of Porta Maggiore

The underground basilica of Porta Maggiore is an ancient sanctuary in Rome featuring three naves supported by six stone pillars. The entire interior is decorated with fine white stucco reliefs that depict mythological scenes and figures.

This underground structure was built in the first century AD and was discovered by chance in 1917 during railway construction work. The site had remained hidden for nearly two thousand years beneath the modern city.

The stucco decorations show scenes from Greek mythology featuring figures like Ganymedes, Orpheus, and Medusa. These motifs point to the spiritual practices of an ancient philosophical community that gathered in this space.

Access is limited and only possible through guided tours on specific dates with small groups to protect the site. It is advisable to check in advance and make reservations, as spaces are restricted.

This is the sole known archaeological evidence of an ancient community practicing Neopythagorean beliefs that remained completely unknown for nearly two thousand years. Its discovery fundamentally changed how scholars understand this spiritual movement in Roman times.

Location: Rome

Architectural style: neopythagoreanism

Phone: +3906699841

Email: anna.desantis@beniculturali.it

GPS coordinates: 41.89180,12.51648

Latest update: December 8, 2025 19:40