. "fortifications of Paris" . "Thiers fortifications of Paris" . "Thiers wall" . "fortification project around Paris" . "Thiers fortifications" . . . . . . . "old city walls" . "defences of Paris" . . . "perimeter" . . . . . . . . "old city wall" . "walls of Paris" . . . "fortifications" . "Paris defences" . . "Thiers wall" . . "fortification" . "'Fortifications'" .