Google Street View has made a mess of this one - it's impossible to continue into the village, it throws you off into who-knows-where countryside with the next step. The church where the menhir is sited is visible here
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There's a photo of the menhir on this website - http://dolmen.free.fr/crbst_8.html
Something is not right. This message is just to keep things from messing up down the road