The New Castle (Irish: An Caisleán Nua) is a ruined castle at the mouth of the Shimna River in Newcastle, County Down, Northern Ireland. The original castle is mentioned as early as 1433 and was built to guard a ford across the river. The castle was rebuilt in 1588 by Felix Magenis. It was demolished in 1830.
Map of Newcastle, UK
References
The New Castle, County Down Wikipedia(Text) CC BY-SA