A small 16th-century O'Doherty tower house perched on a rocky promontory at the head of Pollan Bay on the Isle of Doagh, with Atlantic views and a sea blowhole that erupts at high tide.
Walk up the short hill to the restored keep, round tower and bawn walls built of rough local quartz, with gun loops and wall thickness of about 3 ft 9 in. The site, conserved in 2013 by the Carrickabraghy Restoration Society, was one of four surviving O'Doherty castles in Inishowen and was last inhabited in 1665.
From the exposed summit the eye reaches Malin Head, Glashedy Island, Fanad Head, Five Finger Strand and the Knockamany Bens across Pollan Bay. Clear days reward photographers, and the site is part of the Wild Atlantic Way.
In the rocks at the base of the headland a fissure known locally as the Hissing Rock spouts seawater several metres into the air when the tide is in. Time your visit for high tide and check tide times before setting out.
The long sandy beach below the castle is good for a walk and birdwatching in spring and autumn; you can also walk the strand all the way from Ballyliffin to reach the castle. Quieter Lagacurry Beach is about 1.2 km away via the coastal path.
About 1 km away, this open-air museum of 19th- and 20th-century rural life has the nearest toilets, café and shop if you need them.
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