In April 1756, Jean-Jacques Rousseau fled Paris, “a city of noise, smoke and mud”, and settled in Montmorency, at the place called the “Hermitage”. In December 1757, the Citizen of Geneva moved to the small Mont-Louis, now the Jean-Jacques Rousseau Museum. He composed there his major works: Julie ou la Nouvelle Héloïse, La Lettre à d'Alembert sur les spectacles, Du Contrat Social, Emile ou de l'Education. The condemnation of the Emile caused the philosopher to flee on June 9, 1762. The Museum consists of the small Mont-Louis, house of the philosopher, the garden including the green cabinet and the «Keep». An extension of the house made in the 19th century allows to organize temporary exhibitions and cultural events.