At 2900 metres, the "Traversette" tunnel dates back to the 15th century. It is 72 metres long and emerges on the Italian side beneath Monte Viso. It overlooks the upper Po valley.
Dug over 500 years ago between France and Italy, the ""Pertuis du Viso"", now renamed ""La Traversette"", is Europe's first tunnel. It had an extraordinary history before being largely forgotten.
Opened in 1480 at an altitude of 2850 m, this tunnel is now the oldest in the Alps. It was the gateway from the Dauphiné to a whole other country, the Marquisate of Saluce! It was an underground link between the Guil and Po basins.
The main reason for the tunnel was to ensure a safe supply of salt for the people and livestock of the transalpine valleys.
Over the centuries, this passage has become a valuable part of the historical heritage of the Alps and of Europe.
Today, the Traversette Tunnel is still under threat from erosion and scree, but it can still be used by hikers in summer.
Opened in 1480 at an altitude of 2850 m, this tunnel is now the oldest in the Alps. It was the gateway from the Dauphiné to a whole other country, the Marquisate of Saluce! It was an underground link between the Guil and Po basins.
The main reason for the tunnel was to ensure a safe supply of salt for the people and livestock of the transalpine valleys.
Over the centuries, this passage has become a valuable part of the historical heritage of the Alps and of Europe.
Today, the Traversette Tunnel is still under threat from erosion and scree, but it can still be used by hikers in summer.
Openings
Openings
From 15 June 2025 until 2 November 2025 - Open everyday
Subject to snow conditions
