The Library
Go to NYU's Bobst to do some cocaine/adderall in the basement. The building itself is a hideous, red, window-free jail block. No wonder it drives everyone crazy.
Columbia's most beloved/detested library is the gorgeous Butler, where you can cry yourself to sleep over your textbooks or f*ck in the stacks (you'll probably end up doing both though because finals week is rough). Butler is also home of the infamous Butler Porno #fightthepatriarchy.
[Photo via @kavyashri]