 Peveril Castle stands on a limestone outcrop overlooking the west end of Hope Valley , in the midst of an ancient landscape . Overlooking the head of the valley , 2 km to the west , is Mam Tor , a Bronze Age hill fort , and 2 miles ( 3 km ) to the east at Brough @-@ on @-@ Noe is the Roman fort of Navio . The valley formed a natural line of communication and had extra importance due to valuable mineral resources in the area , particularly lead . 
