In Wales prehistoric sites such as at Bryn Celli Ddu on Anglesey, the open burial chamber dated to around 2000BC, is so perfectly aligned that for only 20 minutes each year, a beam of sunlight aligns exactly with the opening to the chamber.
In Wales prehistoric sites such as at Bryn Celli Ddu on Anglesey, the open burial chamber dated to around 2000BC, is so perfectly aligned that for only 20 minutes each year, a beam of sunlight aligns exactly with the opening to the chamber.
