Colle delle Finestre (el. 2178 m.) is a mountain pass in the Cottian Alps, in the Italian region of Piemonte, Italy, linking the Susa Valley and Val Chisone. The road was built around 1700 to gain access to the fortresses in the area, mainly the Forte di Fenestrelle.
The road serves as tourist attraction although the last 8 kilometres of the road from Susa are not asphalted. From Susa the mountain pass is 18.6 kilometres long at an average of 9.1% (height gain: 1694 m), the maximum gradient being 14%.(Wikipedia)