The St. Cetteo's Cathedral is dedicated to the city's Patron Saint. In neo-Romanesque style, strongly supported by Gabriele d'Annunzio, who wanted to find in this Church a burial place for his mother. The work came to an end in 1939, but the facade was rebuilt after the Second World War. The facade of strictly rectangular form, is decorated with rosettes, with portals to arches that highlight the internal division into three naves, punctuated by pilasters outside. On the left, a bell tower on a square base ends octagonal, while on the right there is the small Baptistery. The tripartite interior is given by marble columns and its choir is emphasized by an apse. On one side of the transept is a St. Cetteo's Chapel, on the other, the Luisa De Benedictis's tomb, mother of Gabriele D'Annunzio, who Arrigo Minerbi has dedicated the memorial: an ark topped by the figure of a young sleeping woman. Inside the Church there is also a painting attributed to Guercino reproducing Saint Francis of Assisi. Important is the organ with pipes in gold, one of the most famous in Abruzzo.