I have been to the Portland location, and as amazing as it is the Hyde Park Powell's will always hold a special place in my heart. I spent many a day in college wasting time in the shelves of Powell's and spent a lot more money there than I should have. My interest in graphic novels was started by a book (Dash Shaw's Bodyworld) I stumbled onto there, my interest in poetry the same (Stanely Kunitz' Passing Through). Perhaps most significantly, I discovered a book on cellular automata there that really kicked off my interest in computer science.