The hereditary seat of the dukes of Argyll, Inveraray Castle has been headquarters of the Clan Campbell since the early 15th century. The gray-green stone castle is among the earliest examples of Gothic Revival in Britain and offers a fine collection of pictures and 18th-century French furniture, old porcelain, and an Armoury Hall, which alone contains 1,300 pieces. On the grounds is a Combined Operations Museum, the only one of its kind in the United Kingdom. It illustrates the role No. 1 Combined Training Centre played at Inveraray in World War II. On exhibit are scale models, newspaper reports, campaign maps, photographs, wartime posters and cartoons, training scenes, and other mementos. A shop sells souvenirs, and a tearoom serves homemade cakes and scones.