Author 'WebMaster FEI' (Id 67078 ) : Ruins of the castle Girsberg, near Ribeauvillé in Alsace.
After three quarters of an hour (from Ribeauvillé) a small walk following the GR5, one falls on these magnificent ruins in which one can walk in complete freedom and almost single-handed.
At the link, it should be the small village of Bergheim lost in the vineyards.
NB: the yellow cast is intentional to give an effect of old photo, which sticks rather well to these ruins.