3 castles, from Norman keeps to the tower houses that Gaelic and Anglo-Irish families raised in their hundreds — and the ones that are now four walls and a jackdaw.
Hope Castle is a historic house and demesne in Castleblayney, County Monaghan, Ireland. Originally a private home, over the course of the 20th century, Hope Castle was used as a military barracks, a hospital, convent, and was most recently used as a hotel before it was damaged by a fire in 2010.
Mannan Castle is a motte-and-bailey and National Monument located in Donaghmoyne Townland, Tullynacross, on site of the Mannan Castle Golf Club, in County Monaghan, Ireland.
Rossmore Castle, also known as Rossmore Park, was a castle on the outskirts of Monaghan in County Monaghan, Ireland. It was built in the Gothic style in 1827 and was the seat of the Barons Rossmore, but fell into disrepair in the 1940s when the family moved to Camla Vale, and was demolished in the 1970s.
Descriptions are Wikipedia's own opening lines, used under CC BY-SA 4.0 with a link to each article; the list and the coordinates come from the same place. Nothing here is a guide to access — many of these are private homes or stand in private fields.