O’Dohertys Keep

O'Doherty's Keep stands on the north-western edge of Buncrana in the townland of Tullyarvan, strategically positioned to control a fording point of the River Crana where it meets Lough Swilly. The sub-rectangular tower house, measuring approximately 9.9 metres by 8.6 metres externally, was constructed in the fifteenth century, probably between 1410 and 1430, when it served as one of the chief r...