Get in touch with your spiritual side and mingle with worshippers at Church of San Martino. Quietly reflect outside for a while or ask if you're allowed to join the next service.
To explore this house of prayer, you'll need to find your way to Fondi. There are loads of other things to see in this area, including Santuario della Madonna della Civita, Acquaviva, and Fondi Baronial Castle.