While most original trenches have been filled in or lost to time, a few restored examples still remain. The Trench of Death at Dixmude is the last remnant of the Belgian First World War trench system. Closer to Ypres, Bayernwald is a restored German trench system. Here, you can also learn how underground tunnelling played a role in the battles of WW1.
During the Battle of Messines, the work of Commonwealth tunnellers played a heavy role in not only battle, but in physically changing the landscape of Flanders Fields. In the summer of 1917, 19 massive underground mines were detonated, the largest non-nuclear explosions in history. Evidence of these massive explosions can be seen at the Caterpillar Crater (Hill 60), the Pool of Peace, and more. The shelled landscape can still be viewed at Hill 60, as well as bunkers from both German and Commonwealth forces.
German bunkers can also be seen at Polygon Wood closer to the Memorial Museum Passchendaele 1917, and in many other places.