154 Wells Ave., Newton, Mass.

Founded in 1961 by Kenneth W. Rendell and his wife-to-be, Diana, Rendells claims to be the world's largest outlet for handwritten manuscripts. Among their vast collection are Hitler's notes for a 1930 speech in Munich. Rendells estimates that the eight-page document will fetch $100,000. Rendells also boasts two books from George Washington's personal library at Mt. Vernon, both signed by the Founding Father. Each is valued at $12,500.