Not a monument or museum, but if you find the built form of Paris interesting and want to know more about its development from early days to now and likely developments, including the notable contributions of Haussmann from the late 19th to early 20th Century (all those stunning stone buildings that grab the eye throughout Paris), you will find this worthwhile.
There is a wealth of material, well-presented and easy to take in.
Entry is free.
There is a special Haussmann exhibition.
Unfortunately, the material has not been reduced to pamphlet or book form, which would have been great, but I guess this body has an eye to service rather than profit - personally, I think it's a missed opportunity all round. They do, however have material accessible on their website, including videos.
Paris is being re-built every day - limited space, pressure on use. If the sight of Montparnasse tower shocks you like a sore thumb, consider how much of what we think defines Paris (Haussmann?) will survive even our lifetime.
Don't assume it's forever.
This isn't for everyone - more cerebral than celebrated - but if you have any interest in this subject matter, it is not to be missed.
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