Dover Castle, Dover, Kent

Setting the scene

Dover Castle boasts the longest history of any fortress in Britain. Standing on top of the White Cliffs of Dover,  the Castle commands the shortest sea crossing between England and the continent. William the Conqueror built the first castle here in 1066. Over the succeeding centuries it has been massively altered, extended and strengthened. English Heritage has two holiday cottages within the castle; Sergeant Major's House and Peverell's Tower.