Just take a 20-minute walk in Paris and you’re likely to glimpse a handful of major landmarks. The Eiffel Tower shoots up from one end. The gilded cap of the Les Invalides gleams just a few blocks away. The Louvre stretches across its waterfront plot, just across the Seine. But in between the staple Paris attractions—or in some cases, a short RER ride away—you’re in close quarters with dozens more significant sites, like the recently renovated Picasso Museum, situated in a 17th-century mansion in the Marais, or Oscar Niemeyer’s slick, undulating design for the Communist Party headquarters, out in the 19th arrondissement.

The City of Light is filled with dozens of historic wonders. But what sites are truly must-see? Check out Architectural Digest's favorite Parisian landmarks that you can't miss on your next trip.