Altes Kurhaus Aachen, Historic spa hall and ballroom in Aachen-Mitte, Aachen, Germany

The Altes Kurhaus is a three-storey, seven-bay building on Komphausbadstraße, erected 1782–1786 to Jakob Couven's design. Its red brick facade has grey stone trim, a rounded pilaster on the left, tall arched windows with a balcony of white wrought-iron railings, and a curved stone pediment with a circular window and carved figures. Inside, the 24 × 11 m ballroom spans the first and second floors and seats up to 340 people under a white stucco ceiling with four golden chandeliers and three arched windows behind dark grey curtains.

Jakob Couven designed the Neue Redoute, approved by the city council on 30 August 1782; the foundation stone was laid on 13 September 1782, and the building opened in 1786. It replaced a two-storey gallery building that had housed the city printing office. A fire after the bombing of 14 July 1943 left only outer walls; Hans Königs led the partial reconstruction from 1965 to 1969, when the garden wing with the concert hall was demolished for a new road.

The name Redoute comes from the French word for ballroom, reflecting its use for balls, concerts and receptions; a casino concession was granted to hotelier Richard Reumont in 1785. The ballroom, 24 by 11 metres and spanning two upper floors, holds up to 340 people and is framed by pre-classical stucco ornaments, with music-instrument reliefs between the floors of the recessed facade.

The building stands at Komphausbadstraße 19, in the pedestrian core of Aachen-Mitte, a short walk from the cathedral and the Elisenbrunnen. The surviving Couven wing and its ballroom are reached from the street side; the former garden wing, demolished for a new road, is marked today by the Klangbrücke. The ballroom holds up to 340 people.

The Klangbrücke, a bridge over the former course of the garden wing, marks where the concert hall demolished in the 1960s once stood. The wing was removed for a new road; the bridge keeps its line visible. The ballroom's present stucco is a 1960s copy, the original having burned on 14 July 1943.