A Lyon Metropole employee walking along a tunnel which is part of a network of underground galleries called "Arêtes de Poisson" (fish bones) under the Croix-Rousse neighborhood of Lyon, France. Photo courtesy: AFP
A Lyon Metropole employee walking along a tunnel which is part of a network of underground galleries called "Arêtes de Poisson" (fish bones) under the Croix-Rousse neighborhood of Lyon, France. Photo courtesy: AFP