 The Church has three asymmetric cruise naves resting on a base rock.The current plan of the church, raised, covered the ossuary, where presumably the Dukes of Caccavone are buried.Notable artwork and craftsmanship in the church are the paintings of the Souls in Purgatory, the Last Supper and St. Anthony Abbot, the reliquary and the urn with a bone of the arm of San Prospero, the patron saint of Poggio, the organ of 1769, the pulpit, the altar, the font and the statue of San Prospero of 1764.