Europe-Places.com has listed approx 129 Historical landmarks in Co. Donegal. Some of the Top rated Historical landmarks in Co. Donegal are- Grianan Of Aileach, Lloyds Signal Tower- Malin Head, Lloyds Signal Tower, Pólifreann or Hells Hole, Pólifreann or Hells Hole, Pólifreann or Hells Hole, Dunlewey Church abandoned, Doe Castle, Doe Castle & Carrickabraghy Castle.