ティエールの城壁
The Thiers wall was constructed from 1841 to 1846 after being proposed by prime minister and future President of France Adolphe Thiers. It enclosed 7,802 hectares along the present-day Boulevards des Maréchaux and a glacis extending to the location of today's Boulevard Périphérique. It was demolished between 1919 and 1929.