Grand Central is truly one of my favorite buildings! I commuted into it every day for over 10 years and although the commute can get to be a bit of nuisance, I loved entering this building everyday. It's simply stunning! It was almost torn down and replaced with a skyscraper but thanks to many dedicated people (Jackie Kennedy, for one) and the New York City Landmark Preservation Commission, it was saved. This article from CNN has lots of great information on this great building. Check out the video of "flash mob" of sorts when over 200 people who just froze for 5 minutes- very cool!