My personal favorite museum in Paris. Why? Architecture, it is an old trainstation, the vibe is very open. No endless galleries of specific era's in art-history, but instead compact exhibitions of art movements, with popular paintings of impressionism, van Gogh, Monet, Manet and so on. And of course the famous 'l'Origin du Monde', the Origin of the World from Courbet's perspective. You will love it!