Bowes Castle in County Durham stands as a remarkable 12th-century fortress built atop the foundations of a Roman fort, strategically positioned to guard the Stainmore Pass through the Pennines. Originally constructed as a timber structure around 1136 by Alan de Bretaine, the castle was subsequently rebuilt in stone by Henry II's engineer Richard the Engineer between 1171 and 1187. The impressive stone keep still rises several stories high, preserving evidence of its role as a significant Norman stronghold during medieval times. Now cared for by English Heritage, the castle's ruins provide compelling testimony to nearly nine centuries of military history spanning Roman occupation through the medieval period.