https://fr.wikipedia.org/wiki/Zone_franche_du_pays_de_Gex https://fr.wikipedia.org/wiki/Zone_franche_du_pays_de_Gex There was a custom's border inside France f

https://fr.wikipedia.org/wiki/Zone_franche_du_pays_de_Gex https://fr.wikipedia.org/wiki/Zone_franche_du_pays_de_Gex There was a custom's border inside France from 1815[0] to 2008, with different treatment for imports/exports from Switzerland to the small part of France beyond that custom's border. According to that article, you can still buy cars w/o EU import duties in that part of France... [0]: Yes, as a result of Napoleon's defeat and as part of Geneva joining Switzerland.