Pierpoint Morgan's private library (not too shabby, if you ask me), is now a much bigger museum with a gift shop and a delicious restaurant. Most recently expanded by architect Renzo Piano, the complex has a soaring steel and glass central courtyard that plays nicely with the original Italian palazzo style building (designed in 1902 by Charles McKim). Sporting not one, but three Guttenberg bibles, this place is a serious treasure trove of impossibly rare books, manuscripts and drawings.