They housed the clandestine comings and goings of Lyon Resistance during the 2nd War. Particularly numerous in Old Lyon, they allowed, in the Middle Age, to quickly reach the boat on the Saône. The Traboules: Lyon secret passageways The Traboules: Lyon’s secret network If you’re feeling a wee bit Sherlock, stroll through the cobbles of Vieux Lyon and the Croix Rousse and try and find Lyon’s historical hidden passageways. They housed the clandestine comings and goings of Lyon Resistance during the 2nd War.