Hôtel de Cluny, Medieval private mansion in Latin Quarter, Paris, France.

The Hôtel de Cluny is a Flamboyant Gothic mansion built between 1485 and 1510 for the abbots of Cluny, with a tall central gable, wings with chimneys and three dormer windows on the slate roof. A stone balustrade runs above the upper gallery of mullioned windows, and the Amboise arms, palé d'or et de gueules, appear on the carved dormer gables. A battlemented wall with a recessed arched doorway stands at the base, and the trapezoidal entrance court holds two sundials and a well.

It was built between 1485 and 1510 under Jacques d'Amboise and incorporated the remains of Roman baths that Cluny Abbey had acquired in 1340. This combination of ancient foundations and medieval construction demonstrates how different historical periods were layered within the same structure.

The mansion has housed the Musée de Cluny since 1843, when the state bought Alexandre Du Sommerard's medieval collection and named his son Edmond its first director. The Amboise arms, gold and red paly, are carved on the dormer gables and high window gables of the facade. In the entrance courtyard stand two sundials and a well whose gargoyle is a wild man, a nod to François Sauvage.

The mansion stands on the left bank at the corner of Boulevard Saint-Michel and Rue Du Sommerard, a short walk from the Cluny-La Sorbonne metro stop. The entrance courtyard is reached through a battlemented wall; the trapezoidal court holds two sundials and a well with a gargoyle carved as a wild man. Visitors pass from the Gothic rooms into the Roman baths, whose frigidarium has survived since the 2nd–3rd century.

Two medieval spiral staircases survive in the building, with the main one featuring intricately carved stone balustrades and vaulted ceilings. These stairs reveal how essential vertical circulation and crafted details were to the design of such residences.