Runs tours of the Catacombe di San Gennaro as well as a fascinating Sunday-morning walking tour called Il Miglio Sacro (The Holy Mile; adult/reduced €15/13), which explores the earthy Sanità district. The Holy Mile tour is in Italian only and must be pre-booked; see the website for details. The ticket office is to the left of the Chiesa di Madre di Buon Consiglio.