Castle 
Fort 
Tower
Castles in Ireland
- Aghadown House
- Aghamarta Castle
- Ardintenant Castle
- Ballincollig Castle
- Ballintotis Castle
- Ballyannan Castle
- Ballybeg Castle
- Ballynacarriga Castle
- Beamish Mausoleum
- Belleek Fort
- Belvelly Castle
- Belvelly Martello Tower
- Blackrock Castle
- Brow Head Signal Tower
- Buttevant Castle
- Cahermone Castle
- Carlingford Castle
- Carrigaline Castle
- Carrigrenan Tower
- Castle Bernard
- Castle Freke
- Castle Magner
- Castle Roche
- Castle Warren
- Castlemartyr Castle
- Castlemore Castle
- Charles Fort
- Clodah Castle
- Clonmeen Castle
- Coppingerstown Castle
- Derryleamleary Castle
- Desmond Castle
- Donegal Castle
- Dunmanus Castle
- Dunworley Castle
- Fota Tower
- Garryvoe Castle
- James Fort
- Kedge Point Signal Tower
- Kilcascan Castle
- Kilcoe Castle
- Kilgobbin Castle
- Kilmeedy Castle
- Knockadoon Signal Tower
- Liscarroll Castle
- Lombard's Castle
- Macroom Castle
- Monkstown Castle
- Monteen Castle
- Mountlong Castle
- Old Head Castle
- Old Head Signal Tower
- Oldcourt Castle
- Rincolisky Castle
- Ringaskiddy Martello Tower
- Ringrone Castle
- Robert's Head Signal Tower
- Seven Heads Signal Tower
- Shanagarry Castle
- Taaffe's Castle
- Toe Head Signal Tower
- Wallingstown Castle
- White Castle