Fort de Souville sits on a wooded ridge between Verdun and Fort de Vaux. It is the least-restored of the major forts — barely more than a ruin, with collapsed concrete galleries and overgrown emplacements — and for that reason gives the most authentic sense of what the battlefield looked like in the years after the war.
There is no formal visitor centre; a parking area on the road below and a marked path leads up. It's a fifteen-minute walk through forest scarred by shell craters and is well worth combining with a Fort de Vaux visit for those wanting more than the headline sites.