On down Lough Swilly to Inch Island and the ruins of its O'Doherty tower house. This is a very romantic place and the best way to get to it is across the rocks from the beach. From this angle its jagged form is silhouetted against the sky with Grianan (see blog 1) visible on the top of the mountain in the distance. A great place for a picnic as you can get up to the first floor via an internal stair. The structure is first mentioned in 1454 and was in ruins by 1600.