Bryn Celli Ddu continues to fascinate archaeologists and linguists.

It is a large mound containing a passage grave, but it is two monuments, one built upon the other, suggesting a change of beliefs during the Neolithic period. The first monument was a henge, a central stone circle, rarely found in Wales. The second monument, a chamber, cairn, a passage grave, completely covering the first, and was probably one of the last megalithic tombs to be built on Anglesey.

For further details please see the CADW website