History in Structure

This site is entirely user-supported. See how you can help.

Grotto about 30m to the south east of Dewstow House

A Grade II* Listed Building in Caerwent, Monmouthshire

We don't have any photos of this building yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »


Latitude: 51.5961 / 51°35'45"N

Longitude: -2.7693 / 2°46'9"W

OS Eastings: 346806

OS Northings: 188862

OS Grid: ST468888

Mapcode National: GBR JH.BN3R

Mapcode Global: VH7BH.Y4BS

Entry Name: Grotto about 30m to the south east of Dewstow House

Listing Date: 29 March 2000

Last Amended: 29 March 2000

Grade: II*

Source: Cadw

Source ID: 23059

Building Class: Domestic

Location: In Dewstow about 1km north of the centre of Caldicot and situated on the north east side of Dewstow Road.

County: Monmouthshire

Town: Newport

Community: Caerwent (Caer-went)

Community: Caerwent

Locality: Dewstow

Traditional County: Monmouthshire

Find accommodation in


The Dewstow estate was bought in about 1890 by the agriculturalist Henry Oakley (died 1940) who was mainly responsible for laying out the very elaborate gardens in the years round about 1900. He may well have been influenced in their design by E J Lowe (died 1900) who lived at the nearby Shirenewton Hall and was also a fern grower. The underground gardens, constructed mainly of concrete block, brick and artificial stone (perhaps Pulhamite), are large and remarkable. The three surviving areas are listed separately.


It is approached from the north down cement steps through a rough artificial stone arch. It is approached from the south through a small roughly circular rockwork area with two pools in the artificial rock floor and no roof. Steps lead down from ground level to another rough arch.


The steps lead to a winding passage lined with artificial rockwork. In the floor of the passage is a narrow rill, which widens into a pool in the central chamber. There is no top lighting, only an occasional hole in the roof to let a small amount of light enter; otherwise this area is completely dark. There are side chambers with fantastic forms and stalactites.

Reasons for Listing

Included as the garden features of an early C19 villa with well preserved character which was occupied for a long time (c1890-c1940) by Henry Oakley, a well known horticulturalist and breeder of shire horses. The garden is principally his work and includes these exceptionally fine and well preserved grottoes from about 1900 which were designed for the growth and display of ferns, an Oakley specialism. It is highly graded for these reasons.

Other nearby listed buildings

BritishListedBuildings.co.uk is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact BritishListedBuildings.co.uk for any queries related to any individual listed building, planning permission related to listed buildings or the listing process itself.

British Listed Buildings is a Good Stuff website.