One of the most unique features of Vieux Lyon is its network of hidden passageways known as 'traboules'. The word comes from the Latin 'trans-ambulare', meaning 'to pass through'. These corridors allowed residents to move quickly between parallel streets by cutting through private courtyards. During the nineteenth century, these were essential for the 'canuts', or local silk workers, who used them to transport delicate fabrics under cover, protecting their precious goods from the rain. Later, during the Nazi occupation in World War Two, the Resistance used this labyrinth to evade the Gestapo, delivering messages through doors that residents left unlocked just for them. Please remember a practical pointer as you explore: if you find a door that is slightly ajar, you might be able to peek inside, but please stay quiet as these are often residential spaces where people live today.