The Lord of the Rings
All of Mary Renault's books about ancient Greece
Dune
Mary Stewart's Merlin books
Another Roadside Attraction
The Chronicles of Narnia
The Riddle Master of Hed trilogy
The Earthsea books by Ursula K. Le Guin
Almost everything else by Ursula K. Le Guin
Darkover
Honor Harrington
The Dark is Rising books by Susan Cooper
Most books by Robert Heinlein
the Ender books by Orson Scott Card
the Alvin Maker books by Orson Scott Card