sentences:  The specific regions comprising the Historic Site include the Roman district and Fourvière, the Renaissance district (Vieux Lyon), the silk district (slopes of Croix-Rousse), and the Presqu'île, which features architecture from the 12th century to modern times.Both Vieux Lyon and the slopes of Croix-Rousse are known for their narrow passageways (named "traboules") that pass through buildings and link streets on either side.The first examples of traboules are thought to have been built in Lyon in the 4th century.