Castles and Towers

   England

• Amberley Castle
• Berkhamsted Castle
• Bodiam Castle
• Bramber Castle
• Buckden Towers
• Buckenham Castle
• Bungay Castle
• Canterbury Castle
• Clare Castle
• Cooling Castle
• Cowdray House

• Donnington Castle
• Eye Castle
• Eynsford Castle
• Framlingham Castle
• Old Gorhambury House
• Hastings Castle
• Hedingham Castle
• Knepp Castle
• Lullingstone Castle
• Odiham Castle

• Orford Castle
• St. Leonard's Tower
• Someries Castle
• Stone Castle
• Walden Castle
• Wallingford Castle
• Warblington Castle
• Wayneflete Tower
• Weeting Castle
• Ypres Tower

   Northern Ireland

• Antrim Castle
• Old Castle Archdale
• Audley's Castle
• Castle Balfour
• Ballygally Castle
• Belfast Castle
• Benburb Castle
• Bright Castle
• Castle Caldwell
• Castle Carra
• Carrickfergus Castle
• Castle Caulfield
• Clough Castle
• Crevenish Castle
• Old Crom Castle
• Derg Castle
• Dundrum Castle

• Dunluce Castle
• Dunseverick Castle
• Enniskillen Castle
• Green Castle
• Harry Avery's Castle
• Jordan's Castle
• Kilclief Castle
• Kilwaughter Castle
• Kinbane Castle
• Kirkistown Castle
• Kirlish Castle
• Castle Lugg
• Monea Castle
• Mountjoy Castle
• Moyry Castle
• Narrow Water Castle
• Necarne Castle

• Newtownstewart Castle
• Ogilby's Castle
• Olderfleet Castle
• Portaferry Castle
• Portora Castle
• Quintin Castle
• Quoile Castle
• Castle Raw
• Red Bay Castle
• Roughan Castle
• Salterstown Castle
• Sketrick Castle
• Strangford Castle
• Trillick Castle
• Tully Castle
• Old Castle Ward

   Scotland

• Craigmillar Castle
• Dirleton Castle

• Hailes Castle

Modern Forts

Star forts and the like, built from the 16th century onwards.

   England

• Deal Castle
• Eastbourne Redoubt

• Sandgate Castle
• Walmer Castle

Martello Towers

Small tower forts, primarily built for coastal defense during the 19th century.

   England

• Martello Tower No. 1
• Martello Tower No. 2
• Martello Tower No. 3
• Martello Tower No. 4
• Martello Tower No. 28

• Martello Tower No. 55
• Martello Tower No. 60
• Martello Tower No. 61
• Martello Tower No. 62

• Martello Tower No. 64
• Martello Tower No. 66
• Martello Tower No. 73
• Martello Tower No. 74

Other

Everything else that doesn't fit into the categories above: follies, monuments, or other structures I simply liked the appearance of.

   England

• Broadwood's Tower
• Eridge Towers
• Painshill Gothic Tower

• Racton Tower
• Saxonbury Tower
• Severndroog Castle

• Vandalian Tower
• Wimpole Castle

   Northern Ireland

• Castle Archdale Tower
• O'Doherty Tower

• Scrabo Tower