100-year-old World War I trenches in a French forest

My great grandfather got drafted into it but got smallpox at boot camp and was in a hospital for the duration so to think that a relative my mother talks about often existed over 100 years ago is weird.

there's a huge part of the battlegrounds that are off limits, still mined

Isnt it in Verdun ?

Dunno, I've never been to Verdun.

Hard to say where it is. I've been to Verdun and this is basically what the entire part of the front looks like there.