While there are several iconic spots, 72 Rue de Varenne (the Hôtel Matignon, residence of the Prime Minister) and 55 Rue du Faubourg Saint-Honoré (the Élysée Palace, home of the President) are the most famous political addresses. However, for the general public and fashion lovers, 30 Avenue Montaigne is legendary as the historic "birthplace" of Christian Dior and the New Look. If you consider "fame" by foot traffic and prestige, the Avenue des Champs-Élysées itself is often cited as the most famous street address in the world. For literary and historical fans, Place des Vosges (specifically No. 6, where Victor Hugo lived) holds immense weight. Ultimately, if a Parisian is asked for the "most famous" single building address, they might point to the Palais Garnier or the Louvre, though these landmarks are so vast they are often referred to by their names alone rather than a traditional street number.