The Wall of the Ferme générale was built between 1784 and 1791 by the Ferme générale (General Farm), the corporation of tax farmers. It was one of the several city walls of Paris built between the early Middle Ages to the mid 19th century. It was 24 kilometers long and roughly followed the route now occupied by line 2 and line 6 of the metro. It crossed the districts of the Place de l'Étoile, Batignolles, Pigalle, Belleville, Nation, the Place d'Italie, Denfert-Rochereau, Montparnasse and the Trocadéro.