Open to visitorsa Cadw site, free to enter — check opening times before you go
Earthworks onlybanks, ditches and platforms — read the ground, not walls
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Castell Bryngwyn Enclosure is one of two henges the Albion Guide charts in Anglesey. It is looked after by Cadw. Its Welsh name is Clostir Cynhanesyddol Castell Bryngwyn.
For arrivals by rail, Llanfairpwll Station is 7.6 km to the north-east. Nearby ancient sites include Bodowyr Chambered Tomb, Perthi-Duon Burial Chamber and Bryn Celli Ddu.