knowth, the largest and most remarkable ancient monument in ireland. spectacular prehistoric passage tombs, part of the world

archaeological civilization spectacular prehistoric destination archaeology remarkable megalithic ceremonial landscape neolithic newgrange structure monument heritage historic drogheda entrance largest ancient ireland passage tourist flyover chamber visitor knowth aerial boinne valley legend travel donore famous bright county burial bronze tombs world river boyne mound place stone sunny great grave drone meath dowth view site tomb road cnoc bru age art bui