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New York City has its hidden alleys, Paris its passages, and Sydney its laneways. But Lyon, France has something even more astonishing perhaps–the traboules. These medieval/Renaissance architectural gems hidden behind closed doors are part passageway, part tower, part courtyard. Predominantly located in Vieux Lyon (old Lyon), the Croix-Rousse, a hillside area that dates back to the Roman period, and the Presqu’île neighborhoods, traboules are examples of urban architecture that are both functional and symbolic. The official number of traboules in Lyon, a UNESCO World Heritage site, vary from 230, as specified on Lyon Traboules to 500.