In reply to idiotproof (Buxton MC): stopped off a at a place called ornans just south of Besancon last year, maybe 3 hours drive from Lux.
Great wee village with good campsite and via ferratas above the vilage . one is about grade 4 easy enough but exposed .and the other is grade 5 and pumpy as hell. There might have been othes nearby as well ,cant quite remembe where though. If you search via the local tourist info site for the area, known as " Le Doubs" you should get more info.
By he way the local cheeses and sausages are good too, hope this helps