Not confirmed — seek landowner or operator permission
Stay within authorised areas. Do not enter unstaffed tunnels, shafts, railway land or restricted property.
How to explore responsiblyWhat the official index records
Historic England / Planning Data records this location as TUNNEL APPROXIMATELY 20 METRES WEST OF THE OCTAGON, WITH FLANKING WALL ATTACHED TO SOUTH. Our atlas groups it under underground using that source wording.
Tunnel Approximately 20 Metres West Of The Octagon, With Flanking Wall Attached To South is recorded by Historic England under reference 1150610. The supplied index identifies TUNNEL APPROXIMATELY 20 METRES WEST OF THE OCTAGON, WITH FLANKING WALL ATTACHED TO SOUTH. Current condition and visitor access are not established by this source index.
Record details
- Category
- Underground
- Source classification
- TUNNEL APPROXIMATELY 20 METRES WEST OF THE OCTAGON, WITH FLANKING WALL ATTACHED TO SOUTH
- Period / construction dates
- Not established from this index
- Current condition
- Not verified
- Designation
- II
- Designation date
- 1986-06-11
- Nearest reference town
- Harrogate (approximate)
- County / historic source county
- Not supplied
- County or local authority (ONS)
- North Yorkshire
- Nation
- England
- Source record ID
- 1150610
- Coordinates
- 54.115849, -1.572339 (reference point, not an entrance)
- Index checked
- 2026-09-13
- Source last updated
- 2026-09-12
- Published access reviewed
- Not yet verified
Index verification means the record and supplied attributes were checked against the official downloaded index on 2026-09-13. It does not mean a site visit or confirmation of current access. Points may refer to a whole complex, a surviving component or a recorded location.