The present structure, a re-building of a collegiate church, was erected between 1782 and 1814 to designs by the architect Andrea Vici (1743-1817), a pupil of Vanvitelli.[1] It has a Greek cross ground plan with three naves, divided by Corinthian columns and pilasters. It has an enormous crypt nine metres high.
The sacristy of the cathedral houses a painting depicting the Apparition of the Virgin Mary near the Convent of Forano to the Blessed Pietro da Treia and the Blessed Corrado da Offida by Giacomo da Recanati. In the church itself is a bust of Pope Sixtus V by Bastiano Torrigiani. The church also houses a canvas depicting a Deposition by Vincenzo Pagani.[2]
