Castell Coch's external features and the High Victorian interiors led the historian David McLees to describe it as "one of the greatest Victorian triumphs of architectural composition." The exterior, based on 19th-century studies by the antiquarian George Clark, is relatively authentic in style, although its three stone towers were adapted by Burges to present a dramatic silhouette, closer in design to mainland European castles such as Chillon than native British fortifications. The interiors were elaborately decorated, with specially designed furniture and fittings; the designs include extensive use of symbolism drawing on classical and legendary themes. Joseph Mordaunt Crook wrote that the castle represented "the learned dream world of a great patron and his favourite architect, recreating from a heap of rubble a fairy-tale castle which seems almost to have materialised from the margins of a medieval manuscript."