Latitude: 53.0709 / 53°4'15"N
Longitude: -4.2998 / 4°17'59"W
OS Eastings: 246018
OS Northings: 355099
OS Grid: SH460550
Mapcode National: GBR 5G.BKZL
Mapcode Global: WH43S.X2NM
Plus Code: 9C5Q3PC2+93
Map layers use either open data or maps from the Ordnance Survey and Maptiler APIs.
Historic map layers are currently experimental and may not necessarily be available all the time.
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NLS (Historic)
Entry Name: Tunnel Passage at Fort Williamsburg
Listing Date: 29 May 1968
Last Amended: 30 September 1999
Grade: II*
Source: Cadw
Source ID: 20466
Building Class: Defence
ID on this website: 300020466
Location: On the northern side of the Fort linking the former Parade Ground and the Tower and beyond to the outer bastions. Fort Williamsburg is approximately 0.5km south-east of the house.
County: Gwynedd
Community: Llandwrog
Community: Llandwrog
Locality: Glynllifon
Traditional County: Caernarfonshire