Very rich in forms, having also a cave lake, the attraction is worth visiting. You will have the chance to make photos inside, just ask the guide how and when. Check their website for the schedule of the guided visits.
Spectacular !!! Driving from Italy to France, we saw the sign and decided to stop. If you are interested in caves, grottos, stalactites this is the place for you. Hard to believe that this isn't a world class location. The tour takes about an hour. About 10-15 minutes from autostrada.
On a very hot summer morning we (a family of five) decided to have a refreshing break and headed to the caves of Borgio Verezzi. There are scheduled guided visits both in the morning and in the afternoon (check the Web for the slots). The caves in Toirano are way more beautiful but may be too big for younger kids...