There's a chap over on the Great War Forum who's made multiple visits to alpine battlefields from that conflict. A few of his amazing photos are in this thread:
Some photos from my recent trip to the battlefields of the Carnic Alps and the Adamello, on the Italian Front. The climb up to the 15cm howitzer on Cresta Croce was more than 5600ft in one day (it nearly killed me). Well worth the trip, though.