footpath across burbage brook winds up to the remains of carl wark fort

britain brook burbage carl wark fort derbyshire england hathersage higger tor hope valley peak district autumn autumnal boulders bracken bridge cloudless countryside deserted fall fern footpath fortress grass gritstone heath hill hillfort hillside hilltop iron age landmark military morning people october outcrop path peaceful pteridium aquilinum rock rocks sandstone sieglingia decumbens sky slope stone stream sunlight sunshine tranquil water wildflower winds rough remains