If you've ever wondered how they keep this "pièce de résistance" of France so shimmering, wonder no more. http://on.natgeo.com/2ufpkGz

If you've ever wondered how they keep this "pièce de résistance" of France so shimmering, wonder no more. http://on.natgeo.com/2ufpkGz 

https://twitter.com/NatGeoTravel/status/881694006895366145