Our verdict
A genuinely distinctive landmark and a proper leg-stretch if you take on the full seven-mile circuit — free parking just off the A36 makes it an easy stop even for a shorter version of the walk.
A chalk ridge south-east of Salisbury topped by an early 17th-century brick folly — hexagonal, bricked up, and also known as Eyre's Folly, built in 1606. The National Trust manages the surrounding down and woodland as a nature reserve, with a seven-mile circular trail through woods and farmland 'brimming with butterflies', and views over the Wiltshire countryside to Salisbury from the top.
National Trust land — usually free to walk; some sites charge for parking.