Caer Williamsburg
Visitors find Caer Williamsburg, a castle, 1.3 km southwest of Groeslon. Officially, it is a Grade II* listed building. Close by, Caernarfon is 7.9 km away, one of 22 within 15 km.
Castle near Groeslon
Just outside Groeslon
Caer Williamsburg is 1.3 km southwest of Groeslon. Towns near it ↓
Grade II* listed building
On the official list of protected heritage. About ↓
Written from OpenStreetMap, Wikidata, the ONS built-up areas and Met Office 1991–2020 averages.
Weather, month by month
Afternoons in Groeslon peak at 17–19°C, June to September.
Caer Williamsburg
- Type
- Castle
- Listed
- Grade II* listed building
- Town
- 1.3 km southwest of Groeslon
Where to find Caer Williamsburg
Orange: Caer Williamsburg.
© OpenStreetMap contributors · Numbers: the places near it, as listed below. · ONS built-up area 2022
Towns close to Caer Williamsburg
In size, Penygroes comes first of the 7, with 1,793 people. All of these towns include it on their pages.
Groeslon
Penygroes
Llanllyfni
Talysarn
Compare the 7 towns
| Town | Where Caer Williamsburg is | People | Places to visit |
|---|---|---|---|
| Groeslon | 1.3 km northeast of it | 826 | 4 |
| Penygroes | 1.7 km southeast of it | 1,793 | 3 |
| Llanllyfni | 2.4 km south of it | 352 | 2 |
| Talysarn | 2.8 km southeast of it | 741 | 3 |
| Carmel | 3 km east of it | 321 | 3 |
| Rhostryfan | 4.2 km northeast of it | 308 | 9 |
| Bontnewydd | 4.8 km northeast of it | 821 | 11 |
What else is near Caer Williamsburg
Choose from 22 places within 15 km, such as 3 castles, 2 forts and 2 heritage railways.
FortCaernarfon7.9 km away2
Castle · CadwCastell Caernarfon7.8 km away3CastleCastle · CadwCastell Dolbadarn13 km away4
Fort · CadwCaernarfon Town Walls7.7 km away5
CastleCaer y Belan6.2 km away6Heritage railwayHeritage railwayWelsh Highland Railway11 km away7
MuseumWelsh Slate Museum14 km away8
Heritage railwayLlanberis Lake Railway13 km awayWithin 15 km, close and well known first. Numbers match the map.
Caer Williamsburg: common questions
Where is Caer Williamsburg?
Caer Williamsburg is 1.3 km southwest of Groeslon, Gwynedd.
What is Caer Williamsburg?
Castle.
When is the best time to visit Caer Williamsburg?
June to September are the warmest months in Groeslon, with afternoon highs of 17–19°C (Met Office 1991–2020 averages).
Is Caer Williamsburg a listed building?
Yes: Grade II* listed building.
What else is there to see near Caer Williamsburg?
Within 15 km: Caernarfon (7.9 km), Castell Caernarfon (7.8 km), Castell Dolbadarn (13 km) and Caernarfon Town Walls (7.7 km).
Places: OpenStreetMap (© OpenStreetMap contributors, Open Database Licence) and Wikidata (CC0), placed in the ONS 2022 built-up area (Open Government Licence v3.0). Visitor counts are the latest Wikidata gives, with their year.
Photos: each place’s Wikidata image, from Wikimedia Commons under the licence below (our copy, resized).
Photo credits (6)
- Caernarfon: Nilfanion, CC BY-SA 4.0, Wikimedia Commons
- Castell Caernarfon: Llywelyn2000, CC BY-SA 4.0, Wikimedia Commons
- Caernarfon Town Walls: Philip Halling, CC BY-SA 2.0, Wikimedia Commons
- Caer y Belan: Phyllis Flannagan, CC BY-SA 2.0, Wikimedia Commons
- Welsh Slate Museum: Talsarnau Times, CC BY-SA 4.0, Wikimedia Commons
- Llanberis Lake Railway: The original uploader was Mick Knapton at English Wikipedia., CC BY-SA 3.0, Wikimedia Commons
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.