Powell's original location in Portland is nothing short of amazing. Its a multi story bookstore that is well organized and easy to browse, its really quite an experience for any who may describe themselves as a 'book lover' or 'book connoisseur'.
The top floor also has a rare books room that is a joy to browse. Last time I went there was only two items they wouldn't let me take out and peruse: the Lewis and Clark journals worth half a million that they kept off site and a 600 year old Italian manuscript.
Its really an enjoyable experience.