Rockfleet Castle, also known as Carrigahowey Castle, is situated on a beautiful inlet off Clew Bay and dates back to the 15th or 16th century.

There are 4 floors within the castle, a corner turret and a large fireplace on the top floor.

The castle was beseiged by troops sent from Galway in 1574 but the invaders were turned back by pirate queen Grace O'Malley. After the death of her second husband, Richard Burke, in 1583, Grace retired to this castle. It was said that she brought with her "all her own followers and 1000 head of cows and mares."