Musee d'Orsay

This is a wonderful old railway station turned into a museum. It features 19th century art, including Europe's greatest Impressionalist Collection. Musee d'Orsay picks up where the Louvre leaves off, featuring French art from the mid 1800s to the 1st World War. The Orsay is covered by the Museum Pass; closed Mondays & crowded on Tuesdays (when the Louvre is closed). You can see this museum's wonderful offerings comfortably in 2 to 3 hours; it is not overwhelming like the Louvre. Photography (without flash) is permitted. Hundreds of pieces of artwork, paintings & sculpture, show-cased in a converted railway station. All the famous (& notorious) artists are represented here: Jean-Francois Millet, Gustave Courbet, Edouard Manet, Edgar Degas, Pierre-Auguste Renoir, Claude Monet, Camille Pissarro, Alfred Sisley, Vincent van Gogh, Paul Cezanne, Paul Gauguin, Henri de Toulouse-Lautrec, Auguste Rodin & his muse, Camille Claudel; WOW!

Although the Lourve is cleary the most well known of Paris's museums, I was ready to go after seeing the Mona Lisa. As someone who likes art, but not the tediousness of having to groom through miles of gallery walls to find something I like, I prefer smaller, more organized museums like Musee d'Orsay (The Orsay Museum).
The museum houses mainly paintings, but also has a nice collection of sculpted art, some of which are by Rodin. One of the things I like best about this museum is it's layout. I love when things are catalogued, and here the paintings are displayed by artist, so if you just want to see,for example, Van Gogh and Renoir, you can easily bypass the rest, see want interests you and then move on to whatever's next on your intinery.
The museum can get busy, particulary, around Van Gogh's work, and my advise to this is be patient - stand back and allow those in front of you to finish 'appreciating'. I had people elbow me to get through and it was extremely irritating!

Expect queues during peak periods (summer ect...) although immediate entry is granted to those with 'The Paris Pass'.

Located across the Seine river from the Louvre this museum holds an outstanding collection of art. These works largly center around the Impressionists and post-Impressionists.

Spend a full day and don't miss my favorites:

By Renoir:
Moulin de la Galette
The Country Dance

By Degas:
Dancers
The Star
L’Absinthe

By Monet:
Haystacks at the End of Summer
Celebration of June 30, 1878 by Monet
Blue Water Lilies
Rouen Cathedral (of which there are 5)

By Van Gogh:
The Siesta
The Church at Auvers
Starry Night Over the Rhone

and of course Whistler's Mother!

Located on the left bank, an old train station was turned into the Orsay Museum, an art museum for mostly French art, including Renoir and Monet. The Orsay is not as big as its better known museum neighbor on the other side of the Seine, but a great collection and a unique setting.