Resume de l’article : De Vinci avait raison : des passages secrets existent bien sous le château des Sforza à Milan

Article: « Léonard de Vinci avait raison: des passages secrets existent bien sous le château des Sforza à Milan »

Answer:
Yes, there are secret passages beneath the Château des Sforza in Milan, as suggested by Leonardo da Vinci. These underground tunnels were discovered during recent renovation work and are believed to have been used for military purposes during the 15th and 16th centuries.