La porte Bourbon - Bourbon gateway
Built in the wall, flanked by two towers, the 13th-century gateway is topped by a machicolation for protection.
There are no traces left of the other two entrances - the southern Porte de Guyenne and the northern Porte Saint Louis. An old image from the 19th century shows vestiges of fortifications near the Creuse river, where Rue de la Cale is today.
