Mysterious medieval tunnels discovered under the construction site of a school near Lyon. Residents of Saint-Laurent-de-Mure, a suburb of Lyon, wanted excavations to be carried out after the discovery of the ancient gallery.
The ancients say that they linked the fortified castle of the Viennese Dauphin, formerly opposed to the count of Savoy. It is said that they were then used in the 19th century by two families of neighboring notables so as not to cross paths.