The Musée national du Moyen ?ge, formerly Musée de Cluny, officially known as the Musée national du Moyen ?ge - Thermes et h?tel de Cluny, is a museum in Paris, France.The Musée national du Moyen ?ge, formerly Musée de Cluny, officially known as the Musée national du Moyen ?ge - Thermes et h?tel de Cluny, is a museum in Paris, France.