The interior of the church of San Pietro Barisano is a large space with three naves separated by large arches on quadrangular pillars, with altars and lateral chapels. The hypogeum levels, extremely articulated, were once used to house the deads: archaeologists have found fragments of decorative apparatuses, of various times; above all, fragments of wall paintings, which cannot be relocated but are equally precious documents for reconstructing the history of the building.
As early as the 12th century, a space known as San Pietro in Veteribus existed on the site, probably entirely excavated in the rock; the Church underwent its first enlargement interventions in the upper level, above ground, in the 15th and 16th centuries, with further excavations inside the rock and the construction of several stone altars leaning against the walls; the Santo Crocifisso and Santa Maria della Consolazione altars, where the interventions were concentrated, probably date back to these phases.
The intervention that gave the Church the structure we see today, dates back to the 18th century: the façade, which bears the date 1755, and the bell tower on the left side of the Church were erected in this century. The parish was abandoned in 1903.