On the Italian front, the First World War had its most considerable theatre in the eastern Alps, since the border with Austria-Hungary traced its crests. The Dolomites, where the dividing line became particularly bumpy, constituted a crucial sector, and therefore were enhanced by both contenders with complex military systems, both defensive and offensive. In Alta Badia, the Great War Tour, about 80 km long, allows you to ski on the traces of history, which dared to get here, between the 2452 meters of the Col di Lana and the 3342 meters of the Marmolada, profaning the solemn silence of the peaks, and to discover entrenchments, siege tunnels, forts.