Some nice pictures of the "Is Zuddas" caves. They are in the Santadi town, the admission fee is 10 euro with guided tour in Italian Language (There's a translation paper summary in English).
There'a restaurant close to the entrance, we had lunch with a good value for money (a single menu was enough for both of us). Find more info at www.grotteiszuddas.com (Italian language)
Point of interest: Is Zuddas caves
Difficulty: none
Difference in height: 0 m
Maximum height: 0 m
Length: 1 km
Duration of journey: 1 - 2 hours
Suggested season: all seasons
Technical equipment : not required