This country’s most ancient known inhabitants were living at Boxgrove 500,000 years ago. There are many Neolithic sites on the Downs, including flint mines and causewayed enclosures, such as those at Cissbury and Whitehawk respectively. From the Bronze Age there are numerous round barrows, including the line of barrows known as the Devil’s Jumps at Hooksway. The many ‘hillforts’ on the South Downs date from the Iron Age, the largest being at Cissbury, which along with Maiden Castle outside Dorchester, is the largest in the country. Roman villas, Saxon forts, and medieval castles and churches are located throughout the South Downs.