The belfry, which is connected to the town hall, is the oldest monument in the walled city. It consists of a square Romanesque tower with an octagonal-shaped floor on top. The belfry was built over a very long period of time: although its construction started in the 12th century, it was not completed until the 18th century. It came within a hair's breadth of being destroyed during the French Revolution, but was spared for the simple reason that it was the only place in town from which you could keep a watch over enemy ships. Indeed, the watchman's post was kept occupied until 1922. The view from the walkway offers a complete panorama of the city and its surroundings; on clear days you can even see England!