The building contains archaeological finds of great artistic value, including a tomb, that of Bishop Silvio Pandone, on the left at the main entrance. Inside a showcase are some vases, a signet ring and some ceramics with ornaments. During restoration work, the ancient apse was found under the altar, from which living water flows. Perhaps the ancient cathedral of Bojano is the only one in the world to have its high altar on a spring of water.
