Schloss Wilhelmshöhe is a Neoclassical palace located in Bad Wilhelmshöhe, a part of Kassel, Germany. It was built for Landgrave Wilhelm (William) IX of Hesse in the late 18th century. Emperor Wilhelm II made extensive use of it as a summer residence and personal retreat.Today, the palace houses the art gallery Gemäldegalerie Alte Meister, part of Museumslandschaft Hessen Kassel.