The belfry, now a UNESCO World Heritage Site, was once the bell tower of the Saint-Martin church, the rest of the building having disappeared during the French Revolution. A symbol of communal freedoms, this belfry also ensured the security of the city. Night and day, lookouts monitored the city and warned of the arrival of enemies or the start of fires by sounding the tocsin. The oldest parts of this building date back to 1474 and rise from the base to the height of the cornice. Supported by wide buttresses, the first bell chamber opens onto triple bays in a Gothic-style pointed arch. Since 1736, this tower has been raised by another level in the classical style into which the second bell chamber opens. This part is topped by a drum where the watch room was located, the whole being topped with a dome and a lantern. Four sculptures made of cast concrete by Marcel Gaumont after the First World War evoke the historical periods of the city. We can see a Frankish warrior; a crossbowman symbolizing the communal militia; Louise of Savoy, mother of François I, who signed the Treaty of the Peace of the Ladies in Cambrai and the knight of Cezen, first governor of the city that became French. The entrance to the belfry has a sculpted decoration by René Faches. The central part bears the arms of Cambrai, surmounted by Saint Martin sharing his cloak to offer it to a poor man. These sculptures evoke the civil and religious duality of this belfry. (Cambrésis Tourisme)