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Cof Cymru: National Historic Assets of Wales · Wales

Grotto at Maesfron

Trewern, Powys, Wales

A Grade II* listed building in Trewern, Powys, designated on 24 January 1995.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Grotto at Maesfron, Trewern, Powys, 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
24 January 1995
Locality
Trewern
Community
Trewern
Unitary authority
Powys
Country
Wales
Coordinates
52.69573, -3.06506
Cadw reference
15641

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 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 151 Welshpool (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
  • 1916 · Sheet 60. Shrewsbury. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

Situated in the landscaped gardens to the south-east of Maesfron house. Built into the steep bank south of the gazebo.

Built c1830-50 for Francis Allen as a feature in the grounds associated with his Regency villa.

Grotto comprising a quartzite facade wall carried over a narrow opening by a half brick arch, the entrance comprising rebated stone jambs carrying a cut stone ogee arch.

Circular interior with decorative pebble floor, and quartzite/calcite faced walls carrying a saucer dome faced with cockle, mussel, oyster etc. shells, and glazed pottery. Shallow wall decorative features, including recessed triangle and Maltese cross patterns.

Graded II* as a scarce example of a C19 grotto that retains its shellwork and as an important element of the landscape garden of Maesfron.

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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