OK, I sneaked off for a weeks holiday on Lake Garda in Italy. Although it was mainly a walking holiday there was a lot of history about as it was on the old Italian/Austro-Hungarian frontier.
Day one was quite stunning as we walked up the mountain at the north end of the lake and passed the remains of lots of fortifications. Monte Brione was covered in fortifications from the water level at Fort San Nicolo through to Forte San Alessandro at the summit. This area of concrete is all that is visible of Batteria di Mezzo part way up.
Late on I discovered that there is a collection of the best sites in the region assembled by Reinhold Messner here http://www.fortezzeimperatore.it/. It seemed that wherever we walked in the area we would come across remnants of WW1. At the refuge at Passo Nota they even had a book covering the fighting in the region (unfortunately in Italian) but with some unusual pictures of troops coping with fighting in the mountains. Quite interesting as we had ascended by a contemporary military road with tunnels, pausing just before the pass at a war cemetery.
Of course the area did not just see fighting in WW1, much earlier the area was controlled by the Scaligeri family who built/extended a number of castles including this one at Malcesine.
It is of particular interest to visit as it details the Venetian expedition to relieve Mantua/Brescia. They had to move 6 galleys, 2 galleons and 26 barques up the river Adige then drag them across the Nago pass to Torbole at the north end of Lake Garda before sailing down to attack the fortifications/dam on the river Mincio.
Even more dramatic was the castle at Arco, though I didn't get chance to visit