A 4K shot of 3200 BC Neolithic stone carvings at Knowth Newgrange Louth Ireland

newgrange knowth boyne valley stone tombs louth carvings ireland decorated stones world megalithic art kerb stones prehistoric bru na boinne heritage river neolithic visitor centre center burial grounds bronze age monuments religious funerary mounds christian medieval passage passages graves ritual remains archaeological chamber hill monument office of public works opw unesco grass sky blue