On the top of the Grianan mountain, not far from the border of Northern Ireland, lies Grianan of Aileach, one of the finest stone forts in Ireland. From the hill-top there are commanding views over Lough Foyle, Swilly and Derry.
The massive stone wall is 3.9m (13ft) thick and encloses an area 23.4m in diameter. In the walls are small chambers; a series of stairs at regular intervals inside the walls gave access to the wall-walk. The entrance is very long and lintelled.
Legend says it was built by the ancient gods; the ring fort was known as the Sun Palace and was held sacred. Traces of ancient earthworks, dating to the early Iron Age, surround the fort, enclosing an area of about 5 acres (0.02 km2). The fort itself was probably built in the early centuries of the Christian era. From the 5th to the 12th century AD it served as the royal seat of the O Neill sept of Aileach
Grianan Aileach's demise and dilapidation has been of great concern to me in recent years and it is most unlikely that it will go away any time soon, rather the opposite.