Alternately, a nature reservation shouldn't have residences in it, should it? When we get away from cities, towns, and villages, it becomes more feasible to just buy enough land to enjoy it without automobiles. A bit lonely though.
True, but the ones that have historically been there are usually grandfathered in when the area as a whole is declared a reservation. There will be strict limits on what you can do with such a place but that's a small price to pay.
There was one for sale here in NL, at least 2500 meters away from any trafficked road but - ironically - the people that live there have road access to their property making the whole thing much worse for the other users of that area such as me when I'm cycling there (the road is only about 2 meters wide).
I'd be very happy if you had bought it, that would save at least two vehicles that still use that road!
One very good way to find such houses is to look at night time satellite images and to look for places with very little light. Any houses in those regions will be in very lightly trafficked areas.
There is still inner city parking too (the underground garages) so Ghent is not really free of cars yet.
If you want to live without cars the best place would be a nature reservation or silence zone, there are a few of those in Europe and the few houses that are there are priced quite high as a result but I think they would come closest to your vision.