This national monument is the Gaulstown Dolmen. It is located in the south of County Waterford and dates to c.3000-4000 BC. It is regarded as one of the finest portal tombs in Ireland. Its name is derived from the name of the townland and is situated at the foot of ‘Cnoc an Chaillighe’ or what is locally known as ‘The Hill of the Hag’. Its east-facing portal stones stand eight feet high and the capstone is 14-feet long and possibly weighing over 40 tonnes. It is likely that the structure was once enclosed by a mound or cairn, which has since been removed or eroded away.