Wow, I was just in France last month and visited the Douaumont ossuary near Verdun. The whole area is eerie. The landscape is just as shown in those photos. It looks like a moonscape. Just driving along, you see craters and hills on both sides of the road. Metal still sticking out randomly. Decaying bunkers all around.
The ossuary itself was an incredible place (120,000 buried there). For those of us not from Europe, it was a lesson in the horrors of WWI that was present for the residents of the continent that has no equal in the US.