The Santuario della Madonna dell'Arco is a Roman Catholic shrine in Sant'Anastasia, a town at the feet of Mount Somma ( Mount Vesuvius' most ancient crater). It is a pilgrimage destination for the so-called 'fujenti' or 'battenti' pilgrims from all over the Campania region every Easter Monday. As they walk, they usually sing a traditional folk song first written in the 15th century and later put to music. A fire is also lit on the bell tower every second Sunday in September for the feast of the Coronation of the Virgin.