This innocuous-looking 11th-century church harbours some fascinating Roman excavations. Beneath the main church you can poke around the claustrophobic foundations of three Republican-era temples and the remnants of an Etruscan vegetable market. Marble columns from the temples were incorporated into the church’s structure and are still visible today.
Visits, led by experts from the Sotterranei di Roma association, are by guided tour only.
