 Traditionally the Upper Ward was judged to be " to all intents and purposes a nineteenth @-@ century creation ... the image of what the early nineteenth @-@ century thought a castle should be " , as a result of the extensive redesign of the castle by Wyatville under George IV . The walls of the Upper Ward are built of Bagshot Heath stone faced on the inside with regular bricks , the gothic details in yellow Bath stone . The buildings in the Upper Ward are characterised by the use of small bits of flint in the mortar for galletting , originally started at the castle in the 17th century to give stonework from disparate periods a similar appearance . The skyline of the Upper Ward is designed to be dramatic when seen from a distance or silhouetted against the horizon , an image of tall towers and battlements influenced by the picturesque movement of the late 18th century . Archaeological and restoration work following the 1992 fire has shown the extent to which the current structure represents a survival of elements from the original 12th @-@ century stone walls onwards , presented within the context of Wyatville 's final remodelling . 
