A previously unknown landscape has been discovered to house a cairn cemetary, ritualistic sites, and burial mounds.
From The Guardian:
Archaeologists have uncovered a prehistoric ritual landscape that possibly includes a cairn cemetery around a 5,000-year-old burial mound aligned with the summer solstice sun on Anglesey.
Bryn Celli Ddu, a Neolithic passage tomb on the Isle of Anglesey. Photograph: Alamy Stock Photo
Though far less famous than Stonehenge, the spectacle of sunlight shining down a long narrow passage to light up the inner chamber of Bryn Celli Ddu on the longest day of the year is unforgettable. Excavation now suggests the site had significance for prehistoric people that lasted for millennia after the earth mound was raised over a stone passage grave.