When you reserve a hotel room online, you never know what kind of view to expect. Room 77 aims to change that. On Room77.com, you can search for rooms at hotels in 18 cities, including New York, Chicago, and London. You can stipulate a high or low floor and set a variety of other preferences—close to or far from the elevator, say—and book adjoining rooms. The site generates a list of rooms, including details like floor number, that best match your criteria. Then, you can click on a hotel diagram to see a photograph showing the approximate view from each room. One drawback: To book a specific room, you must call the hotel.