The Lansdowne Monument, also known as Cherhill Monument, is a 38 metre (125 foot) stone obelisk erected by Third Marquis of Lansdowne to the designs of Sir Charles Barry to commemorate his ancestor, Sir William Petty in 1845.
The monument was restored by the National Trust in 1990; however, the base of the monument is inaccessible due to the erection of nets to catch stonework dislodged by the recent cold winters.
This monument is 100 metres away from the watershed of the River Avon and the River Thames and is located near the Cherhill White Horse.

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