Tunnel Approximately 20 Metres West Of The Octagon, With Flanking Wall Attached To South

The tunnel, built around 1730, is located approximately 20 metres west of The Octagon Tower in Studley Park. It is likely designed by Robert Doe for John Aislabie. The structure is partly rock-cut and constructed with dressed tufa and limestone blocks in a rustic style. The tunnel measures about 50 metres in length, with a floor that rises steeply and curves to face east at the uphill end, near the Octagon Tower.

The south facade features a round-arched tunnel mouth with large voussoirs and a keystone. Attached to the left is a wall that is approximately 1.5 metres high and 3 metres long, which has a narrow round arch opening onto a terrace walk and viewpoint. The north facade is similar to the south, but its voussoirs and keystone appear almost monolithic. Inside, the tunnel lining includes narrow arched recesses, three on each side, each about 2 metres high, which may have been intended for statues or torcheres. This tunnel forms a group with The Octagon Tower and Mr Aislabie's Kitchen.