I rather roughly defined this as being a trip from the cliffs that overlooked Ushant in France to the point where the continent dividing line of the River Volga has its estuary, at Astrakan, in what was still then Soviet Russia. It would be a passage of 4,000 miles or so, slicing neatly across the Iron Curtain from the Loire to the Caspian: in all ways, an admirable expedition.
Mentioned a while back, since then Google Street View has made several visits to Câmpulung Moldovenesc, which does not now look quite so grubby as Winchester describes, with a number of BMW and Audi cars visible.