Founded between the 8th and 9th centuries A.D. over a pre-existing Roman Temple of the Dioscuri -- two of its columns remain on the facade -- San Paolo Maggiore was completely redone in the 16th century. The interior was decorated by many important artists of the 17th and 18th centuries, but the standouts here are the statue Angelo Custode by Domenico Antonio Vaccaro to the left of the central nave; the frescoes in the sacristy -- considered the best work of Francesco Solimena; and the Cappella Firrao to the left of the presbytery, one of the most beautiful baroque chapels in Naples.