Wilhelmshöhe Castle is a neoclassical palace located in Kassel, built in the late 18th century and extensively used by Emperor Wilhelm II as a summer home and personal retreat. Today, the palace houses the Art Gallery, and has been included in a UNESCO World Heritage Site. The museum displays a unique collection of furniture and fixtures from the Imperial period in more than 20 rooms, such as the dining room, picture gallery, writing room and bathroom, where it displays furniture and furnishings, as well as many historical paintings from the eighteenth century.