The Kurhaus Kolonnade has the longest hall in Europe (129 m) supported by pillars.
In 1827 it replaced the vendor's booths and stalls which had previously stood there.
Today this is where people gamble for small stakes in the casino's Kleines Spiel.
Various events and exhibitions are also held here.

At the request of Kaiser Wilhelm II, the Kurhaus as it stands today was built by Friedrich von Thiersch between 1904-1907 in the Neo-Classical style.
The imposing Ionic portal bears the Wiesbaden coat of arms with its three lilies and the phrase "Aquis Mattiacis" (the waters of the Mattiaci).