Palais de la Porte Dorée
If you're bound for the Bois de Vincennes, pay a visit to the Palais de la Porte Dorée, which was built for the 1931 Colonial Exhibition and is one of the best examples of Art Deco architecture in Paris. The ornate facade features bas-relief sculptures representing France's erstwhile empire. Inside, the elaborate marble, ornate metalwork, frescoes, and original lighting are all beautifully maintained. Entry to the ground floor is free. On either end are furnished salons, one representing Asia, the other Africa; peek into the central room, called the Forum, where restored Africa-inspired mosaics line the walls. The upper floors are occupied by the Musée Nationale de l'Historie de l'Immigration, a fascinating modern museum tracing the history of immigration in France through photographs, artworks, and first-person accounts. The basement contains L'Aquarium Tropical, a favorite among generations of Parisians, who all visited as kids, with a pair of rare albino alligators, plus 300 species of exotic marine life. Be sure to check out the Palais's excellent temporary exhibitions.