These first few shots give you a look inside of the clock tower—which is accessible through a ladder located in very secured closet—as well as the view it delivers when the Tiffany glass is opened up. The clock is 13-feet-wide. (Photo by Sam Horine/Gothamist)
Link to Article: 
http://gothamist.com/2013/02/01/14_photos_of_a_grand_central_youve.php#photo-1
Article Source: 
Gothamist