The starting point is on Avenue de Narbonne, by the 19th-century fountain, at the foot of the Eiffel-style footbridge.
Cross the road (Avenue des Corbières) and begin your ascent to the fort via Rue de la Paix. Continue uphill, taking Rue des Escaliers then Rue Rampe du Fort (a small town square, Place Dupré is to your left). Turn right onto Rue du Fort and enter the Fort quarter through the porch tower in the castle wall, which guarded the north entrance. Pass by the Church of Saints Justus and Pastor. The 11th-century Castle of the Lords of Durban is on your right.
You have a choice of two circuits to go back down to the quay:
1. Via Chemin des Lisses (this is a path that runs alongside the castle). This brings you to Rue du Fort. Cross the street and take the tiny steps to Rue Bellevue. Turn left and take a series of steps, and follow the passage to Avenue des Corbières. Return to the starting point.
2. Via Rue des Remparts, join up with Rue Rampe du Fort and go down towards Avenue des Corbières (via Rue du Centre); see the old cobbled village streets and the covered streets, typical of medieval architecture. Return to the starting point.