Father John D'Orazio looks at the Tullianum, the lower level of Mamertine Prison where Sts. Peter and Paul where allegedly held in captivity before their martyrdom. The plaque indicates where Sts.

The Tullianum cistern, built before the Carcer and pre-existing it, was incorporated into it sometime in the 3rd century BCE, adding an extra element of horror.

An ancient Roman prison, where Saints Peter and Paul are said to have been incarcerated, has been re-opened to the public in Rome following a lengthy restoration. The 3,000-year-old Carcer Tullianum ...