This little 600-year-old castle at the edge of a mirrorlike lake is so perfect it’s hard to believe it’s real. A battlement wall with round towers at the corners encloses the central tower house, which was once the stronghold of Clan Sweeney. Built in the early 16th century, the castle was extensively restored in the 18th century and was a used as a home until 1843. Uninhabited since then, it’s now maintained by Historic Ireland. It’s a lovely little place, surrounded on three sides by the waters of Sheep Haven Bay, and on the fourth by a moat carved into the bedrock that forms its foundation. The view from the battlements across the bay is superb. If the entrance is locked, you can usually get the key from the caretaker in the house nearest the castle.