The best ones I can think of are:
Why are so many recent books (recent meaning published in the past thirty years)? Perhaps the best of all are both recent by my definition.
The Well at the World's End,
The Wood Beyond the World,
A Horse Called Ampersand,
The Unbearable Lightness of Being,
Love in the Time of Cholera,
Captain Corelli’s Mandolin,
The Room in the Dragon Volant (a novella, I admit),
The Worm Ouroboros,
At the Back of the North Wind,
The Weirdstone of Brisingamen,
When William Came (Saki - it's about a German invasion),
The Unpleasantness at the Bellona Club (a Lord Peter Wimsey murder story),
A Far Cry from Kensington,
The Long Dark Tea-Time of the Soul,
A Short Walk in the Hindu Kush.
A Short History of Tractors in Ukrainianand
Midnight In the Garden of Good and Evil.Oddest and least inviting title? I nominate Geriatric Dentistry in Eastern European Countries. I once thumbed through a copy of this very rare book in a shop in the Charing Cross Rd.