At the same time as the passage and chamber were being built, work on the mound was going ahead.

At Newgrange, and the main mound at Knowth, an area around the tomb was left clear for a platform of stones to encase and stabilize the chamber roofs.

Once the passage roof was complete, structural experts returned to the kerb and continued to set the slabs in place — either in sockets or on prop stones, so as to achieve an even top-line all-round the mound.

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