Traboules are unique architectural features found primarily in the city of Lyon, France. These are hidden passageways that connect streets and buildings, allowing pedestrians to move through the city more easily. Originally built in the 4th century, they were used by silk workers to transport their goods while avoiding the weather. The traboules are characterized by their narrow corridors and staircases, often leading to courtyards. Many of them are located in the historic districts of Vieux Lyon and La Croix-Rousse. Today, they serve as a fascinating glimpse into the city's history and are popular among tourists exploring Lyon.