Where Did Dewey File Those Law Books?: "The hotel opened three years ago at Madison Avenue and 41st Street. From its imitation card catalog in the lobby to its stately second-floor reading room, it is designed as a siren for book lovers. Each floor is devoted to one of the 10 main categories of knowledge in the Dewey system: Social Sciences, Languages, Math and Science, Technology, the Arts, Literature, History and Geography, General Knowledge, Philosophy and Religion.

Hotel guests can request a specific floor or themed room, furnished with the corresponding books. History buffs might consider the ninth floor, with Biography (900.006) or Asian History (900.004). A technology aficionado might give Computers (600.005) a try.

The most popular rooms, by far? Erotic Literature (800.001) and Love (1100.006). Room and suite prices on the hotel's Web site range from $295 to $770 per night."