Carl Wark hill fort in the Peak District from the air
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aerial photograph of Carl Wark hill fort in the Peak District Derbyshire England UK. Carl Wark is an enigmatic structure, being a natural promontory with natural cliffs on one side and man made embankment on the other. While the designation as a hill fort is not universally accepted, Historic England class it as a slight univallate hillfort. The hillfort is thought to date from the late Iron Age with signs of occupation extending to after the Roman Period after which there was quarrying activity for making of millstones.