Musée National du Moyen Age/Thermes de Cluny (Musée de Cluny)

Along with the Hôtel de Sens in the Marais, the Hôtel de Cluny is all that remains of domestic medieval architecture in Paris. Enter through the cobblestoned Cour d'Honneur (Court of Honor), where you can admire the flamboyant Gothic building with its vines, turreted walls, gargoyles, and dormers with seashell motifs. First, the Cluny was the mansion of a rich 15th-century abbot, built on top of/next to the ruins of a Roman bath . By 1515, it was the residence of Mary Tudor, widow of Louis XII and daughter of Henry VII and Elizabeth of York. Seized during the Revolution, the Cluny was rented in 1833 to Alexandre du Sommerard, who adorned it with medieval artworks. After his death in 1842, the government bought the building and the collection.

This collection of medieval arts and crafts is superb. Most people come to see The Lady and the Unicorn Tapestries, the most acclaimed tapestries of their kind. All the romance of the age of chivalry -- a beautiful princess and her handmaiden, beasts of prey, and house pets -- lives on in these remarkable yet mysterious tapestries discovered only a century ago in Limousin's Château de Boussac. Five seem to deal with the senses (one, for example, depicts a unicorn looking into a mirror held by a dour-faced maiden). The sixth shows a woman under an elaborate tent with jewels, her pet dog resting on an embroidered cushion beside her, with the lovable unicorn and his friendly companion, a lion, holding back the flaps. The background forms a rich carpet of spring flowers, fruit-laden trees, birds, rabbits, donkeys, dogs, goats, lambs, and monkeys.

The other exhibits range widely: Flemish retables; a 14th-century Sienese John the Baptist and other sculptures; statues from Sainte-Chapelle (1243-48); 12th- and 13th-century crosses, chalices, manuscripts, carvings, vestments, leatherwork, jewelry, and coins; a 13th-century Adam; and recently discovered heads and fragments of statues from Notre-Dame de Paris. In the fan-vaulted medieval chapel hang tapestries depicting scenes from the life of St. Stephen.

Downstairs are the ruins of the Roman baths, from around A.D. 200. The best-preserved section is seen in room X, the frigidarium (where one bathed in cold water). Once it measured 21*11m (69*36 ft.), rising to a height of 15m (49 ft.), with stone walls nearly 1.5m (5 ft.) thick. The ribbed vaulting here rests on consoles evoking ships' prows. Credit for this unusual motif goes to the builders of the baths, Paris's boatmen. During Tiberius's reign, a column to Jupiter was found beneath Notre-Dame's chancel and is now on view in the court; called the "Column of the Boatmen," it's believed to be the oldest sculpture created in Paris.