L’Hôtel de Sully

This impressive 17th-century mansion was once a private home but now houses the Centre des Monuments Nationaux. Although the interior of this ‘hôtel particulier’ isn’t open to the public, it’s still worth visiting to walk through the cobblestone courtyards and admire the building’s beautiful architecture. And it’s right on the corner of the Place des Vosges, another must-see in the Marais!