As always, Musée du Louvre is the most confusing museum on the planet.  This museum is so big that I can get lost easily, and I actually did!  I only spent my two hours there exploring the Sully section of the museum which houses mostly paintings from the 17th to 19th century including Dominique Ingres, Paul Ruben, Jan Veneer and many of the impressionist artists such as Claude Monet and Alfred Sisley.