This lonely cabin we've seen after approx. 1 hour of hike from L'Armone camping above village of Lozzi, Corsica, France up to highest mountain of the island - Monte Cinto.
Building looks like abandon mountain challet, but it could serve as a shelter for shepherds in the past.
In topographical maps of Corsica we have, it is marked as a "bar", located at the end of the "road" with "parkinglot".
Road itself is currently in bad condition, it is rather rocky path, passable only in all-terrain vehicles.
There's not much left in the building, basically just a garbage, bits and pieces of furniture and so.
However, roof is still in good condition, so cabin can serve as a fair place to stay over night or bad weather.
I don't have other information about this shack.