Düsseldorf is all about impressive architecture, a buzzing nightlife and a thriving art scene. Visit the Schloss Benrath, a baroque palace set in formal gardens just outside town, shop until you drop along the leafy avenue of Königsallee or marvel at 20th-century art (and an impressive collection of over 100 works by Paul Klee) at the Kunstsammlung Nordrhein-Westfalen (K20).