This is an image I have been chasing a long time now. Conditions have to be almost perfect in order to get this image. Patience paid off and I got this on 21 July 2021.
An Grianán is located on the western edge of a small group of hills that lie between the upper reaches of Lough Swilly and Lough Foyle. Although the hill is comparatively not that high, the summit dominates the neighbouring counties of Derry, Donegal and Tyrone. Located at the edge of the Inishowen peninsula, it is 11.25 kilometres (7 mi) northwest of the ecclesiastical site of Derry. The histories of the sites are closely linked. There is much legend and historical material related to the Grianán of Aileach. The Irish annals record its destruction in 1101. The main monument on the hill is a stone cashel, restored in the nineteenth century, but probably built in the eighth century CE. The summit’s use as an area of settlement may go back much further. A tumulus at the Grianán may date back to the Neolithic age. A covered well was found near the cashel in the early nineteenth century.