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Cof Cymru: National Historic Assets of Wales · Wales

Observatory at Bryn Bras Castle

Llanrug, Gwynedd, Wales

A Grade II listed building in Bwlch, Llanrug, Gwynedd, designated on 27 August 1999.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Observatory at Bryn Bras Castle, Llanrug, Gwynedd, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Gardens, Parks and Urban Spaces
Date of designation
27 August 1999
Locality
Bwlch
Community
Llanrug
Unitary authority
Gwynedd
Country
Wales
Coordinates
53.14050, -4.17641
Cadw reference
22256

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1896 map "Sheet 7. Ordnance Survey of England and Wales." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1896 · Sheet 7. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 106 Bangor (Outline) (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 106 Bangor (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
  • 1919 · Sheet 41. Anglesey. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

Located on rising ground in the 'Woodland Garden' to the east of Bryn Bras Castle.

The observatory was built in the 1920s during the ownership of Duncan Alves and replaced a summer house previously on the site.

Observatory. Circular tower of rather dumpy proportion. Rendered rubblestone on simple plinth with rendered brick parapet and horizontal railing to flat roof. Round-headed windows with iron bars but no glazing and entrance on south-east reached by a short flight of steps; stone corbel table below parapet.

Interior not accessible at time of Survey (February 1999) but has one ground-floor room with staircase leading to viewing platform on roof.

Included as one of a number of garden structures erected in the 1920s, an important period for the development of the gardens and grounds at Bryn Bras Castle.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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