Bryn Celli Ddu is a prehistoric site on the Welsh island of Anglesey, near Llanddaniel Fab, meaning 'the mound in the dark grove' or 'the mound in the sacred grove'. It was looted in 1699 and later excavated between 1928 and 1929. The current mound was added during a restoration in the 20th century. Originally, the area housed a crómlech and a henge, but during the early Bronze Age, the stones were removed to build a typical passage tomb on top of the henge. Inside the burial chamber, a stone with spiral and serpentine designs was found, which is now housed in the National Museum of Wales. Bryn Celli Ddu is also known for its relationship with the summer solstice, as sunlight flows into the passageway on the longest day of the year.
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