Traboules are a unique feature of the city of Lyon in France, particularly known in the historical areas of Vieux Lyon and Croix-Rousse. These hidden passageways date back to the 4th century and were initially used by the city's silk manufacturers and other craftsmen to transport their goods more efficiently. Traboules allowed the inhabitants to traverse buildings and courtyards to reach the Saône river quickly while staying protected from the weather or avoiding the busy streets. The architecture of traboules is diverse, ranging from Gothic to Renaissance, and these passageways often open up into stunning internal courtyards, with sometimes spectacular staircases and amazing architectural details. While originally there were around 500 traboules, today approximately 40 are open to the public. They have played a significant part in Lyon's history, offering secret meeting spots during the French Resistance in World War II. Walking through the traboules provides a glimpse into the city’s past and is a must-do for visitors striving for an authentic experience of Lyon’s heritage.