The four pillars of history are:
. Ancient Ireland - i.e.Newgrange, the Boyne Valley, Loughcrew
. Early Christian Ireland - i.e. Clonmacnoise, Glendalough, Mellifont, Jerpoint and Holycross Abbeys.
. Medieval Ireland, i.e. Kilkenny, the Viking Quarter in Waterford, Trim Castle, Rock of Cashel.
. Anglo Ireland, i.e. the Great Houses and Gardens, Dunbrody famine ship, Wicklow Gaol.