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La Coupole, a vast concrete dome for V2 rockets, is walkable but a bit of a trek. There’s a museum about the site and WW2 in general, and also a planetarium: first a film with multi-lingual headsets about the birth of aviation, then the planetarium talk in French. We didn’t go, but Saint Omer town is much closer at approx 30 minutes walk. Aéro-club website lists numbers for taxis.