and the Massif Central (extinct) volcano range, the tunnel was famous for its traffic jams caused by a combination of local traffic, that of neighboring countries, as well as traffic between northern and southern France. Threats to survival The hill is very fragile in places due to springs, underground streams, ancient tunnels and aqueducts, which have caused several subsidences in the past. Gallery See also Nuits de Fourvière Jardin des Curiosités References External links 5th arrondissement of Lyon Quarters of Lyon World Heritage Sites in France