Besides the Louvre, Notre-Dame and several churches, two large residences from the Middle Ages can still be seen in Paris: the Hôtel de Sens, built at the end of the 15th century as the residence of the Archbishop of Sens, and the Hôtel de Cluny, built in the years 1485–1510, which was the former residence of the abbot of the Cluny Monastery, but now houses the Museum of the Middle Ages. Both buildings were much modified in the centuries that followed. The oldest surviving house in Paris is the house of Nicolas Flamel built in 1407, which is located at 51 Rue de Montmorency.