The present church is baroque in style, but contains some works of art of earlier periods.
Agatha, containing the relics of the saint, retains its three original Norman apses (1091), but is otherwise a large baroque edifice.
The interior was restored in the baroque style in 1712.
Maria Maggiore, founded in 1137 and completed in 1355, with a baroque interior and some interesting works of art.
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).