When you want to be historically right, the 'Great Library' or 'Library of Alexandria' does not count as 'wonder of the world', though the original list of the seven wonders was made up IN the library of Alexandria
Those are:
1. The pyramid of Giza
2. The Hanging Gardens of Babylon
3. The Statue of Zeus at Olympia
4. The temple of Artemis at Ephesus
5. The Mausoleum of Mausollos at Halicarnassus
6. The Colossus of Rhodes
7. The Lighthouse of Alexandria
Maybe the librarians did not recognize the importance of their project.
But don;t worry, other buildings that are NOT offical 'wonders of the world' include Stonehenge, The Colloseum, the great wall of China, and The Taj Mahal. (some built later than the list was made up)
read more about it here:
http://en.wikipedia.org/wiki/Seven_Wonders_of_the_Ancient_World