A must see if you're visiting Paris France, is obviously the Louvre. Imagine that every single wall and ceiling of every single level in this building is covered in spectacular art. Now remember there are more levels underground - including where you can see the "foot" where the original castle (built by Philippe II in 1190 to defend against Viking attacks) met the moat. The Musée du Louvre is one of the largest museums in the world, lying right between the Seine river and the Rue de Rivoli. Dan Brown made the glass pyramid famous for me especially... it lies in the axis of the Champs-Élysées.
