I absolutely love the smell of old books, the really old ones at the library or at the used book shops. It's kind of musty but not like any other musty smell I've ever smelled. First thing I do when I crack open an old book is sniff it

Another weird one is the smell of horses. I LOVE the smell of horses. When I've been petting them, I always wash my hands, but I prefer not to use a perfumy soap so that I can smell the horse smell on my hands for a while, til it wears off. No other animal smells like a horse and I can't get enough of it.

I also love the smell of lilacs, coffee (but hate the taste), and I love the smell of beer (but also hate the taste). Lots of other smells I like, but those are probablly the most uncommon.