A Wind in the Door and A Wrinkle in Time and A Swiftly Tilting Planet by Madeliene L'Engle. Really for younger readers but good stuff.

Philip Pullman's His Dark Materials is marvelous.

Disc World series and Hat Full of Sky by Terry Pratchett

The Belgariad is a bit average.

Adult reading -

Ash: A Secret History - Mary Gentle is phenomenal. Joan of Arc like character is being investigated by modern day historians - I can't say more without giving away.

Damn! I am gonna reread that. Take it on holiday along with Pullman.