Purdown is a large green hilly area on the edge of Bristol and is one of the highest points of the city. It's marked out by two buildings: the telecom tower and the large yellow dower house - a familiar sight to anyone who regularly drives along the nearby M32. Helen Mark explores the area, finding out about its significance in World War II, and meeting the goats which are now helping to preserve the remains of the gun placements put there to protect the city from bombing raids. She also learns about the history of Stoke Park estate, and goes on a hunt for hidden artwork in the woods