In an area of several Long barrows you may think you are in Wiltshire, rather than Hampshire. The parish of Whitsbury was part of Wiltshire until 1895, and is still under a Wiltshire parliamentary constituency. This barrow seems to be the most accessible. The fantastic ‘Hampshire Treasures’ resource gives the following info – “Whitsbury Down. 60 m long and 30 m wide. Surrounded by a ditch. In exceptionally good condition. Scheduled Ancient Monument no.448”