A promontory fort is an Iron Age hillfort that is located on a promontory of land so that the steep scarp slopes form the natural defences of the fort. They are quite rare with only about one hundred recorded frequently on coastal headlands. They are thought to be high status permanent settlements sited for display as well as defence. Knolls End Promontory Fort is at the west end of Live Moor and the most obvious feature is the rampart and ditch across the neck of the spur including a gap for an entrance. The earthworks are accentuated at this time of the year by the lush growth of bilberries. Knolls End was first identified from aerial photographs in the 1970s and to date is unexcavated. The long distance footpath The Cleveland Way cuts through the site but few walkers are aware of its existence.