One of my favorite riding/recreation areas was on the front lines of the Italian Campaigns of WWI along the high plain of Asiago (Alto Piano) in the area between Monte Grappa and Monte Passubio.
You cant walk in the woods without finding deritius from that time, metal, shoe soles, trenches, etc.
Ironically, we owe some of the best riding in the world to the supply routes on both sides in the Dolomites.