The greatest library of ancient culture built in Alexandria, Egypt some time around 145 B.C. It was burned down when the city was sieged and it is believed to have held near endless ancient knowledge. It has a sort of memetic reputation as many believe the "Burning of the Great Library of Alexandria" Set humanities technology and knowledge back several thousand years.
"Stupid people like you wouldn't exist if the library of Alexandria never burned down." -As an insult to intelligence
"You're the kind of person that would burn down the Great Library of Alexandria aren't you?"-As an insult to say someone is mean/selfish
An awesome place that is underrated in today's society.
Think about it - where else can you chill in an air-conditioned place, that's quiet, where you can read a cool mag or surf the net, where you can take a nap, check out movies, meet some friends for a game of chess or cards, read about whatever you like, get free bookmarks, talk to some fine librarians, walk around aimlessly, find out how glow-in-the-dark works..... and all for free!
Dude 1: "Man, it's hot and humid outside. There's nothing to do in here. Dang I'm bored."