If you love mysteries, this store is definitely worth a visit in NYC. Sadly, it's the last of its kind here. There used to be one in my neighborhood called "Murder Ink" that I loved, not just for the books but also for its 2 kitties-in-residence, one of whom was a huge handsome longhair named Clouseau!
http://www.mysteriousbookshop.com/
http://www.mysteriousbookshop.com/