Thermes de Cluny are the ruins of the communal baths in Roman Lutetia (2nd century A.C.). Two halls have preserved well, one of which had the biggest dome in Roman Gallia. To replace the baths, the house of the abbots of Cluny Abbey was built in the 15th century; it is now an example of Gothic secular architecture. Today, the MusГ©e de Cluny, officially known as MusГ©e National du Moyen Г‚ge (National Museum of the Middle Ages), is housed here. It was opened in 1843. The most famous artifacts include the originals of Biblical kings' heads that were knocked down from the facade of Notre Dame de Paris during the First Republic, and the 15th century Gobelin tapestries "La Dame Г la Licorne" (The Lady and the Unicorn).