The Palais de la Légion d’Honneur, also known as Hôtel de Salm, is a historic neoclassical palace on the Left Bank of the Seine, at 64 Rue de Lille, in Paris’s 7th arrondissement, next to the Musée d’Orsay. It serves as the headquarters for the Légion d’honneur, France’s highest order of merit, and houses the Musée de la Légion d’honneur et des ordres de Chevalerie.
Built between 1782–1787 for Prince Frederick III of Salm-Kyrburg, the building was nationalized during the French Revolution and became the seat of the Légion d’honneur in 1804. The palace was destroyed by fire during the Paris Commune in 1871 but was rebuilt soon after. It was classified as a historical monument in 1985.
 
Interesting facts...
The Légion d’honneur is the highest French distinction, awarded for eminent services to the nation, both civilian and military.
Thomas Jefferson was deeply inspired by the Hôtel de Salm’s neoclassical architecture, especially its large copper dome and Roman triumphal arch entrance. He incorporated these elements into his redesigns of Monticello and Poplar Forest, and also recommended them for Washington, D.C.’s city plan. Indeed A statue of Thomas Jefferson stands nearby on the Pont de Solférino, looking toward the Hôtel de Salm, commemorating his admiration for the building.