Doon Fort is an ancient ring fort hidden away on Doon Lough near the coastal village of Portnoo in co. Donegal. It dates from the 5th century a.d and was probably built as a place of refuge. It’s walls stand 4.8m high and are 3.6m thick. The fort covers most of the island which was partially constructed with the use of large stones like a crannog, while the walls were built of smaller hand size stones. As well as ‘Doon Fort’ it is sometimes called ‘The Bawan’ or ‘The O’Boyle Fort’ as it became their stronghold in the 16th century. It was also the scene of the murder of Conor O’Boyle in 1530 who was slain by a rival O’Boyle family member! It’s construction methods are similar to other Irish dry-stone wall forts such as Dun Aengus on the Aran Islands, Grianan of Aileach in Burt, co.Donegal and Staige Fort in Kerry. This National Monument is now on land belonging to a friendly local family who until recent times used it as a walled garden. During the holiday season they have small boats available for hire.