Grotto about 30m to the south east of Dewstow House is a Grade II* listed building in the Monmouthshire local planning authority area, Wales. First listed on 29 March 2000. Grotto.
Grotto about 30m to the south east of Dewstow House
- WRENN ID
- dusk-attic-owl
- Grade
- II*
- Local Planning Authority
- Monmouthshire
- Constituency
- Monmouthshire MP: Catherine Fookes (Lab)
- Country
- Wales
- Date first listed
- 29 March 2000
- Type
- Grotto
- OS grid reference
- ST 468 888
- Coordinates
- 51.59608, -2.76934
- Source
- Cadw listing
Description
The Grotto, located about 30 meters southeast of Dewstow House, is a 19th-century structure approached from the north via cement steps that lead through a rough artificial stone arch. From the south, visitors enter through a small, roughly circular rockwork area featuring two pools set in an artificial rock floor, with no roof overhead.
Descending steps from ground level lead to another rough arch, which opens into a winding passage lined with artificial rockwork. The floor of this passage contains a narrow rill that widens into a pool in the central chamber. This area lacks top lighting, relying instead on occasional holes in the roof to allow a small amount of light to enter, making it otherwise completely dark. The grotto includes side chambers adorned with fantastic forms and stalactites.
Local climate
Grotto about 30m to the south east of Dewstow House receives an average of 860 mm of rain a year. This makes it wetter than 62% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 63% of listed buildings.
It experiences an average of 36 freeze-thaw cycles a year, more than 64% of listed buildings. Of these, 15 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
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- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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