Some extraordinary bookstores:
Foyles Bookshop in London [Huge. Chaotic. Marvelous. One entire room is dedicated to Pepys's diaries. They once tried to get Hitler to give them his banned books instead of burning them. He refused.]
The Poisoned Pen Bookstore in Scottsdale and Phoenix [Mystery books. Eventually, every mystery writer winds up here for a signing. Even the dead ones.]
The Elliott Bay Book Company in Seattle [Be sure to check out their bargain section.]
Guidon Books (Western Americana and Civil War books) in Scottsdale [You'll find the hard-to-find ones in their specialty.]
Any other nominees?