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It was a very interesting experience, both from the fact that there are still unexploded bombs in the area, as well as the dead who have not been recovered. For the historically challenged, keep in mind that World War I ended for all intensive purposes in 1918 - almost 90 years ago.
The other interesting tidbit was the difference between the french and german trenches. The german ones are extremely organized and made with perfectly sized stones - where the french version is more (sorry) haphazard.