The Frasassi Caves are open to public and they are considered among the most famous show caves in Italy. Although the total length of its corridors is around 30 km, the touristic course that is open to all (also toddlers and elderly people) amounts to over 1.5 km of corridors and rooms. Guided tours take approximately 1.5 hours.
The Frasassi Caves include the magnificent Grotta Grande del Vento, which is so big that the Milan Cathedral would fit inside it easily.
Entrance is possible on all days except: from 4-25 December and from 10-30 January.
Because only a small part of the cave system is included in the leisurely tourist walks there are also routes for the more adventurous visitors that are graded by difficulty: percorso azzurro (the blue trail) and percorso rosso (the red trail). You are supposed to be reasonably fit and prepared to get a little wet and have to crawl and squeeze through narrow openings.
The caves were discovered by a group of speleologists from Ancona in 1971.
Flora and fauna
Inside the cave it is a constant 14 °C.