castles and fortresses and towers

We Have Always Lived in the Castle by Shirley Jackson
Haunted Castle: An Interactive Adventure Book by Leo Hartas
I'm the king of the castle by Susan Hill
The enchanted castle by E. Nesbit
Howl's Moving Castle by Diana Wynne Jones

Poetical Vagaries of a Knight of the Folding-Stick, of Paste-Castle
The castle of crossed destinies, by Italo Calvino
Siege of Leeds Castle, by Edwin Harris
Nightmare Abbey, and Crotchet Castle, by Thomas Love Peacock
Castle Rackrent and the Absentee, by Maria Edgeworth

Kenilworth
The Fortress of Solitude
The Proud Tower
Ivanhoe
Deus Lo Volt! A Chronicle of the Crusades

Green Angel Tower by Tad Williams
The Dark Tower by Stephen King
The Castle in the Forest by Norman Mailer
The Castle of Lyr by Lloyd Alexander
Castle in the Air by Dianna Wynn Jones

The Two Towers by J.R.R. Tolkien
The Glass Castle by Jeannette Walls
Warwick Castle by David Green
Digital Fortress by Dan Brown
The Princes in the Tower by Alison Weir

I capture the castle
The castle of Otranto
The Keep
The sandcastle
Castles in the air

Castle Keep
Fort Pillow, a novel of the Civil War
Blandings Castle by P. G. Wodehouse
The Battlement Garden
The Black Tower by P. D. James

The Glass Castle by Jeannette Walls
Castlevania: The Official Hint Book by Donald McCrary
Castle by David Macaulay
The Palace of Laughter by Jon Berkeley
The Ivory Tower by Henry James