If your French is up to it, the French equivalent of the Ordnance Survey publishes all sorts of maps, not only of France but of former French colonies.
I've just bought a couple of excellent anniversary maps from them - WW1 and D Day. Each is overprinted with the main military dispositions, sights to see, a brief history etc. Commentary and map notes in French (!), English and German. The WW1 one has QR codes to relevant websites, and marks routes you can take supported by the relevant app to guide you round. They're under a tenner each including postage and imho a bargain. The truly shocking thing on the WW1 one is the sheer scale of the trenches - you just dont believe they dug all the way from the sea to the Alps pretty much, but they did. And where they got to in October 1914 was basically where they stayed for the next 4 years. http://loisirs.ign.fr.
The only downside is the IGN website is it's tout en Francais, but it's a very conventional layout and O Level will see you safely through...
Anniversary Maps from French IGN
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