Ballycarnahan Castle is said to have been built by a branch of the O’Sullivans in the early seventeenth century. It stands on a rocky knoll by Eagle Rock riding stables a short distance south of Caherdaniel village, overlooking Derrynane Bay. Two stories of the building survive but a third appears to have existed. A mouth harp, often known as a jews’ harp, found in a small opening in the east wall, is now in the Kerry County Museum in Tralee.
The mouth harp is an instrument found throughout the world. It consists of a flexible metal or bamboo tongue or reed attached to a frame. The tongue/reed is placed in the performer’s mouth and plucked with the finger to produce a note.