FENESTRELLEItaly
Fort of Fenestrelle
Local name: Forte di Fenestrelle
The largest fortification in the Alps is famous for the world's longest underground staircase, which has 4 thousand. degrees. Covering an area of 130 hectares, the fortress was built between 1728-1850 to protect access to Turin through the Chisone Valley.
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Fort of Fenestrelle
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Fort of Fenestrelle popular in the area
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