"A great mountain of pure salt that grows as it is extracted." This is how, according to Aulus Gel·li Cató described, in the second century, one of the most important potassium salt mines in the world, located in Cardona. It is a depression of land shaped like an elongated ellipse with an area of ​​100 hectares and containing unique natural and geological features. It has been exploited as an open mine since the Neolithic era, and from 1900 to 1990 through extraction, following the discovery of potassium salts by the engineer Emili Viader i Solé.

"La Muntanya de Sal de Cardona" (the Salt Mountain of Cardona) is now a cultural and tourist centre dedicated to promoting the importance of the geological site and its utility for man through the centuries.

The museum area is an open space that explains the geology, mineralogy and botany of the "Vall Salina de Cardona" (Salt Valley of Cardona), included since 1992 in the Plan for Areas of Natural Interest in Catalonia.

You can also learn about the history of the exploitation of salt throughout the centuries. Entering the old mining pit, you can see a unique piece of industrial archaeology: salt extraction machinery designed and built during the 1920s.