In the early 1940's there was a connection (in name only) with a colourful aristocrat who died a bit before the photo was taken in the 1920's.
I'm guessing the aristocat is Manfred von Richthofen.
The possible 1940s connection is that Jagdgeschwader 2 "Richthofen" was based near the channel coast in France in the early 1940s (Le Touquet-Etaples airfield?)
The location in the photo looks very much like a racecourse, which in the 20s and 30s often served as airfields, and the only place I can think of in the Pas de Calais area that had a flourishing racecouse is Le Touquet Paris-Plage.
So how about Le Touquet?