
Tinnahinch Castle is a ruined tower house erected in 1615 by James Butler near the River Barrow in County Carlow to control passage over the river. The rectangular structure features a stair tower at the southwest angle, machicolations protecting the doorway, and a bartizan on the northeast angle, representing characteristic medieval defensive architecture. Strengthened by the Confederates during the Irish Confederate Wars of 1641, the castle was subsequently burnt in 1700. Located on private property with windows lost to theft and a deteriorating barbican structure, the tower presents challenges for preservation and remains endangered.