With three naves and three apses, this evocative basilica is often likened to a clover leaf. Parts of it date from the 6th century while the facade is the result of a 1914 revamp. The 16th-century rose window and 16th- and 17th-century frescoes enhance the appeal. The apses are centuries-old and feature some eye-catching sculpture on the right.
A craft and antiques market fills the piazza in front of the basilica on Saturdays.