Tunnel de l'Étoile
The 501st longest tunnel in the world
The Tunnel de l'Étoile is a tunnel in Paris. In the past it was a road tunnel, but since 2020 it is a bicycle tunnel. It links the Avenue des Champs-Élysées to the Avenue de la Grande Armée, passing underneath the Place Charles de Gaulle and the Arc de Triomphe. It is around 400 metres long.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).