This beautiful town hall of brick and stone is located in a beautiful green setting. It was designed in Flemish Renaissance style with Tudor influences, and built on the border of the original town of Calais and the town of Saint-Pierre, to seal the merger of the two municipalities. Although construction began in 1911, the town hall was not completed until 1925 due to damage in WWI. It also suffered damage in WWII. Inside, a stained glass window illuminates the grand staircase and commemorates the retreat of the English.
The belfry has been on the UNESCO World Heritage List since 2005. It has been completely restored and equipped with a lift. At 75m high, it offers a panoramic view of the city and the harbour. Since 1961, it has been fitted with an electronic carillon, which plays Gentille Annette van boieldieu every hour.