preshistoric stone temple, megalit columns and roof, poulnabrone dolmen in ireland

aged ancient and archeology architecture boulder building columns construction country countryside covered culture dolmen famous field flat geologic grass grave green heavens hill historical history house hut ireland irish landscape megalit megalithic monolit natural nature neolithic old outdoor outside pile place portal poulnabrone prehistoric preshistoric remaining rock roof ruin rural sacred sky stone sunlight sunny temple tomb top under wall