We hiked the Lagazuoi tunnels (gallery) open air museum and retraced the route of the Italians and Austrians fighting for Cortina and the Dolomites during WWI. The Italians won when they decided to go against the triple alliance they had with Austria/Germany and instead joined the Allied forces.
Our hike started with with a huge gondola ride (could fit 20 people and had a druver onboard) that took us straight up the mountain to a high rifugio, where we had strudel and a cappuccino. The views were simply amazing, getting us above the clouds to where the peaks poked through the mist as if we were in an airplane. After, we had a bit of an airy walk, technically an easy via Ferrara where holding the cable was very welcome.
Then it was into the tunnels, where headlamps and helmets were pretty much a necessity. Then it was down, down, down in the dark, over slippery wet wooden steps and boulders. Again, the iron cable was very handy. It took us quite awhile and our knees took quite a pinding on the 2,300 feet of descent. We saw barracks and shooting hikes along the way as well as cisterns and provision caches.
After we finished with the tunnel, we again faced some very edgy parts of trail and rickety ladders on the rock before ending up back at the lift. We then had lunch and then visited the museum built into an old Austrian fort. Read more here. http://www.altabadia.org/en/summer-holidays/trekking-hiking/mount-lagazuoi-rock-tunnel.html