The Terra Salina itinerary includes four historical sites where salt was produced or where its history is told: the Mines of Bex (Switzerland), the Arc-et-Senans Royal Saltworks (in the Doubs region), the Great Saltworks of Salins-les-Bains (in the Jura region) and the Roman salt transportation tracks of Vuiteboeuf (Switzerland). There are three cities with thermal centres: Yverdon-les-Bains (Switzerland), Salins-les-Bains and Lons-le-Saunier (Jura) and seven sites that are on the UNESCO World Heritage list: La Chaux-deFonds/Le Locle – urban design for watch-making, the Old Town of Bern, the Prehistoric Pile Dwellings around the Alps (on the edges of the Neuchâtel lake), the terraced vineyards of Lavaux, the Arc-et-Senans Royal Saltworks together with the Great Saltworks of Salins-les-Bains, and the fortifications of Vauban with the Citadel of Besançon.