The "underground passage" starting in the courtyard leads to a tranquil and restful public garden, built between 1930 and 1936, which leads into the rue d'Enghien via the exit of the City Hall since 1372. The carillon concerts of the Belfry are perfectly audible here. There also is the sculpture of the "Ropieur" [cheeky Mons street urchin] (Gobert, 1937) which splashes the water of its fountain on the passers-by, symbolising the rebellious attitude of the Mons boy.