Discovered in 1971, the Frasassi caves stretch for 13 kilometres. Catch the bus from the carpark below and get transported into a fantastic underground world. The roof of the Cave of Wind towers 100 metres above your head and has fascinating Stalactite and Stalacmite structures. There is plenty to see, and an English speaking tour runs at around 11.15am. They describe how the system was found, and tell you of the names each section has. Such as Abyss Ancona, Crystallised Lake, The Little Fairies Castle and The Grand Canyon.
The whole experience lasts around two hours, but for the more adventurous you can book to go even further with one of the experts, who will take you further down the potholes in top class gear. On your return to the surface there are other things to see, like The Abbey of San Vittore and the Archaeological museum. The nearby towns of Genga (Famous for its springwater) and Jesi (Famous for its Verdicchio wines) are also worth a visit as they are spectacular examples of Medieval towns. Why not also pull in a visit to nearby Fabriano and its museum of how paper was and still is made in the town?