Castell Bryn GwynBrynsiencyn, Anglesey

Castell Bryn Gwyn, Brynsiencyn, Angelsey, North Wales

Castell Bryn Gwyn - or White Hill Castle - is Neolithic in origin but was in use up until the Roman period and potentially beyond. It’s a great site for prehistory enthusiasts and is well worth a visit if you want to spend a little time soaking up some culture.


Castell Bryn Gwyn - translating into English as White Hill Castle - is a grassy circular bank with clay and gravel lying underneath the surface and external stone-built walls. The area within the walls is approximately 54 metres in diameter. It saw human habitation from the Neolithic period up until the Roman occupation of Britain. No one can say how high it was originally, but today it stands at a still impressive 4.9m (12ft).

Castell Bryn Gwyn is situated on the south-west corner of the island of Anglesey. There are a few monuments and historic sites in close proximity within this corner of the island, so it’s possible to make a day or afternoon of exploring these sites and the surrounding landscape. Bryn Celli Ddu, Caer Leb and Castell Bryn Gwyn are all situated along the A4080 road leading from Llanfairpwll to Brynsiencyn and beyond. Why not make an afternoon of it and do your own historical site hop? With all three sites being free, it’s a fascinating and inexpensive way to expand your knowledge of Britain’s distant past.

Opening times

Daily: 10m - 4pm.
Last admission 30 minutes before closing.
Closed 24th, 25th, 26th December and 1st January.

Picnic spot



Free parking but it is a long walk from Castell Bryn Gwyn itself.


Due to uneven ground, this attraction isn't recommended for wheelchair users or those with mobility issues.


Dogs are welcome.


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