There are two New Yorks that reside in the city – one is up during the day, while the other sleeps through the day and is up at night. The Columbia campus is similar.
One of the most beautiful buildings in the campus is the Butler Library (random trivia overheard during a campus tour for undergrads: it is one of 25 libraries in the university)
This was a click during the evening..
And this one I lifted from wikipedia..
But my favourite picture of the library is this one (clicked by a friend from the Engineering School)