Set within the Apuan Alps natural park, this is one of the most complete cave systems in Europe. A visit is particularly informative for both the variety of formations present and for the competence of the guides.The caves are well equipped, illuminated and easy walkways make the visit possible, showing off the extraordinary beauty of the underground world formed of tunnels, glistening stalactites and stalagmites, lakes and waterways, as well as strange, colourful and fantastic concretions.