Seconding Victoria's suggestion of The Circus of Dr. Lao, a great satirical fantasy. (Noting to self to look into the Ryman.)
Some stand alone fantasies, a mix of various types, not just secondary world:
The Lord of the Rings by J. R. R. Tolkein (yes, I would have mentioned if you'd asked for series/trilogies, since that's how it was packaged; Tolkein saw it as one large work, though)
Jonathan Strange & Mr. Norrell by Susannah Clarke (there's a companion volume of short stories, The Ladies of Grace Adieu, that isn't necessary for enjoying the novel, but are good reading on their own)
Something Wicked This Way Comes by Ray Bradbury
The Land of Laughs, The Voice of Our Shadow, Bones of the Moon by Jonathan Carroll
The Last Unicorn, A Fine and Private Place, Tamsin, The Innkeeper's Song by Peter Beagle (not related novels; there is a story collection related to TIS, Giant Bones, but it's not necessary to read it with the novel)
The Red Tree by Caitlin Kiernan (dark fantasy)
A Feast of Sorrows by Angela Slatter (story collection, with the feel of fairy tales)
The Forest of Forgiving by Theodora Goss (story collection, with the feel of fairy tales)
Briar Rose by Jane Yolen
The Face in the Frost by John Bellairs
Deadfall Hotel by Steve Rasnic Tem
Victoria is right, though, that a little information on what you like would make it easier to hit that target.
Randy M.