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Latitude: 53.0728 / 53°4'22"N
Longitude: -4.3018 / 4°18'6"W
OS Eastings: 245890
OS Northings: 355316
OS Grid: SH458553
Mapcode National: GBR 5G.BKHM
Mapcode Global: WH43S.W1Q5
Plus Code: 9C5Q3MFX+47
Entry Name: The Mill Folly Grotto including stone bridge, south of the Afon Llifon
Listing Date: 8 September 1998
Last Amended: 30 September 1999
Grade: II
Source: Cadw
Source ID: 20472
Building Class: Domestic
ID on this website: 300020472
Location: Situated approximately 200m east of the house, on the south side of the valley of the Afon Llifon.
County: Gwynedd
Community: Llandwrog
Community: Llandwrog
Locality: Glynllifon
Traditional County: Caernarfonshire
Tagged with: Grotto
Built by the 3rd Lord Newborough, continuing his brother's many improvements to the pleasure grounds begun in 1820's. Known as the Mill Folly on account of its picturesque design in the manner of a ruined mill. Part of it may have been adapted as a fernery later in the C19 by F G Wynn who was especially interested in ferns.
Glynllifon was the seat of the Wynn family and Sir Thomas John Wynn became the 1st Lord Newborough in 1776. The house was rebuilt after a fire 1836-48 by Edward Haycock, architect of Shrewsbury. Influence for some of the garden features came from the family’s grand tours.
Irregular rustic rubble garden feature with picturesque pointed arches. There are two levels, the lower level of which was a pool and the bridge carried the footpath over the outlet into the Afon Llifon. There is a complex series of grotto-like spaces including an underground chamber reached by a narrow passage and a further small chamber at the lower level. The pool was fed by a reservoir on the hill towards Fort Williamsburg via a leat from the top of the cascade to the east. The single-arch rubble bridge has voussoirs and a modern timber deck.
Listed for its special interest as a distinctive C19 garden feature within this exceptionally fine context.
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