The present church is baroque in style, but contains some works of art of earlier periods.
The interior was restored in the baroque style in 1712.
The cathedral has a Romanesque Gothic portal of 1332 by a Roman marble worker named Deodatus, and the interior is decorated in the Baroque style, but still retains the pointed vaulting of 1154, introduced into Italy by French Benedictines; it contains a splendid silver antependium by the 15th-century goldsmith Nicolo di Guardiagrele (1433-48).
Agatha, containing the relics of the saint, retains its three original Norman apses (1091), but is otherwise a large baroque edifice.
Maria Maggiore, founded in 1137 and completed in 1355, with a baroque interior and some interesting works of art.