The old town hall is one of the most important medieval town halls in Germany. Its oldest structure dates from the 13th century. It was used for the meeting of the old town council, and the large thorn was also used for festivities. The old town hall consists of two wings that meet at right angles. The Brunswick cubit is embedded in one of the pillars of the arcade, which mainly served as a measure for the cloth merchants (57.07 cm).
On the right-angled balcony above there are nine interesting pillar figures by Hans Hesse from the 15th century, depicting Ottonian and Guelph emperors, kings and dukes with their wives.
The old town hall serves the city as an exhibition and representation building. On the ground floor and in the historic cellar vaults, the Braunschweig City Museum presents a permanent exhibition on the history of the city of Braunschweig (9th century - 2005) as well as changing special exhibitions. The city welcomes its guests in the mayor's room and in the large hall of the main building, the Dornse. Non-profit and private organizers can also receive their guests there, as the representation rooms can be allocated.