Monte Viso Tunnel
The 526th longest tunnel in the world
The Monte Viso Tunnel (Buco di Viso, Pertuis du Viso) is an Alpine pedestrian tunnel excavated in the rock during the Renaissance and located eight kilometres north of Monviso (Cottian Alps), northern Italy. It is 75 m long, 3 m wide, and located at an altitude of 2,882 metres linking the villages of Crissolo in the modern Italian province of Cuneo and Ristolas in the French department of Hautes-Alpes. Opened in 1479, it is one of the oldest tunnels in Italy and may be one of the oldest in all of Europe.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).