Forte del Gran Serin is a military fortress at an elevation of 2.602m (8,536ft) above the sea level, located in the Province of Turin in the Italian region Piedmont. It's one of the highest mountain roads of the country.
The path to the summit is an old miltary road. It’s called Strada Militare del Gran Serin and it was built in 1884. The acces is blocked by a barrier. The road is extreme. 4x4 vehicles with high clearance only. It’s very narrow, with deep washouts and loose gravel. Impassable from September to June. This track can get very muddy and slippery after rain. The road starts from the famous Colle de l’Assietta.