One of the finest galleries of its kind in Germany, the Old Masters Picture Gallery is spread across three floors of excellence within the Schloss Wilhelmshöhe. 17th century Dutch and Flemish works take most of the attention but this is a pan-European collection, covering everything from the Late Gothic to Neo-Classicism. The palace has housed a gallery since way back in 1509 and that tradition continues today, and any self-respecting art lover should be making a beeline for this beaut.