One if the most impressive buildings in DC--even though the urinals are rather ordinary. We took the time to get ourselves official reader's cards. Made a quick trip up to the rare books department and checked out a first edition of the Book of Mormon (here to download a PDF; here to see online). Also saw a Gutenberg Bible. The one we checked out had 'Martin Harris' written in the back. Who knows if it was original or not. IMHO it is one of the coolest buildings in DC.