Classiebawn Castle, Country house in Cliffoney, Ireland.

Classiebawn Castle is a country house on the Mullaghmore Peninsula in County Sligo, Ireland. The yellow-brown sandstone structure shows a central tower with a conical roofed turret and stands directly above the cliffs facing the Atlantic Ocean.

Viscount Palmerston, British Prime Minister, began construction in the 1860s, but the house remained unfinished after his death. His stepson William Cowper-Temple completed the work in 1874, turning the estate into a livable summer residence.

The Irish name Caisleán na Clasaí Báine refers to the white trench, although the sandstone walls read yellow-brown. The house was long tied to the Mountbattens, who spent summers here from 1939; Edwina Mountbatten and her husband added electricity and mains water. Lord Mountbatten, last Viceroy of India, returned each summer until 1979.

The estate is privately owned and not open for tours, but the exterior view is clearly visible from several public spots along the coastal road. The best view appears from the beach below or from parking areas near Mullaghmore harbor.

Lord Mountbatten, the last long-term resident, died in 1979 when a bomb exploded on his fishing boat off the coast. The act happened during the Troubles and shaped the memory of the region to this day.