Palais Wittgenstein is one of Karlstadt's refined old townhouses, a reminder that Düsseldorf's centre is not only shopping streets and Rhine promenades. The 18th-century building has been restored after wartime damage and now serves as a small cultural venue, especially for chamber concerts and literary events.
It is a selective stop rather than a headline attraction. Pair it with a walk through Karlstadt, the Stadtmuseum, or the southern edge of the Altstadt, and look for it as part of the city's quieter architectural fabric.