I think I read that there is a kind of... Museum of France.... housed in Versailles... sounds interesting
As far as I could discover it only consisted of a number of bare rooms displaying portraits of early modern French royals and a few historic panorama paintings like Napoleon's coronation.
I also heard that you can wander round the grounds of Versailles totally free of charge !
That's true and great, as the park is the best thing about Versailles, I'd say.