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Photo: via Wikimedia Commons, CC BY-SA 3.0
Guided tours conducted all day, ID required. Formerly the Palais Bourbon, this building has housed the National Assembly, the French parliament's lower house, since 1827. Some interesting architecture and the library features the painting l'Histoire de la civilization by Delacroix. Visitors may be interested in attending assembly debates.
The National Assembly is the lower house of the bicameral French Parliament under the Fifth Republic, the upper house being the Senate. The National Assembly's legislators are known as députés or deputies.
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Housed in a former Beaux-Arts railway station (completed in 1900 for the Exposition Universelle, later saved from demolition and converted to its present use), the rambling, open-plan museum is home to the works of the great artists of the 19th century (1848-1914) - Impressionists, post-Impressionists, and the rest - that were formerly displayed in the l'Orangerie. This is perhaps the most spectacular collection of European impressionism in the world—breath-taking rooms full of Manet, Renoir, Monet, Van Gogh, and many others. Impressionist represent the biggest draw, but there is much more to explore.
This museum is in the historic Invalides complex and presents the history of the French Army. It is co-located with Napoleon Bonaparte's tomb (entry to which is included in the ticket price). Most of the exhibitions are very old fashioned, and the coverage of the First World War is surprisingly limited. A highlight is the Musée des Plans-Reliefs, which displays painstakingly accurate models of French fortresses and includes its own shop.
A museum dedicated to the life and work of the great sculptor. The house contains an extensive collection, which is unusually well presented in a spacious building with big windows that are open in nice weather, which makes this museum double pleasant.
Founded in 1671 by Louis XIV as a hospital for 6,000 wounded soldiers—this function explaining the name of the building—the golden-domed Hôtel des Invalides still functions as an infirmary and now also houses the Musée de l'Armée. The church attached, l'Eglise du Dôme, houses the tomb of Napoleon.
Paris Sewer Museum
For an interesting take on Paris, check out the underground sewers of Paris. See swords found in the sewers over the years and get an appreciation for what it takes to keep Paris running.
Opened in 2006, this is the newest and the most modern of Paris' great museums, housing an outstanding collection of tribal art, with a particular emphasis on France's former (and present) territories in Oceania and Africa. The museum is large and you can easily spend half a day browsing, especially if you pause to explore the multimedia presentations.