The center of Cividale del Friuli consists of the large square where the Cathedral stands, on the site of the ancient Roman forum (Forum Iulii, name from which that of the Friuli region derives), rebuilt in its present form by Pietro Lombardo starting from 1457 .
With a very simple facade, it has an interior with three naves. At the altars there are paintings by Palma il Giovanni, Pomponio Amalteo, Caspare Diziani and Pordenone.
The Treasury is now a Museum and contains some pieces of extraordinary importance, such as the Ara of Ratchis and the Baptistery of Callisto from the 8th century, the Marble Chair from the 10th century, as well as marbles from other churches, cibori, plutei, reliquaries. Longobards, works in silver and gold as well as the sword of the patriarch Marquardo. Cividale also hosts the Christian Museum, which houses some of the most representative examples of early medieval sculpture, especially from the Lombard period.
Near the Duomo is the Palazzo dei Provveditori Veneti, built by Palladio around the middle of the sixteenth century. The Palazzo hosts the National Archaeological Museum, the most extraordinary collection of weapons, jewels and epigraphic documents of the Lombard civilization.
Opposite is Palazzo De Nordis. From Piazza del Duomo you can then reach the Ponte del Diavolo, built in the fifteenth century and rebuilt several times, with a beautiful perspective on the Natisone.