The idea of travel does not accompany a hunt for the best libraries in the picked destination, unless of course you are a bibliophile. Libraries should not be seen as mere repositories of books but as a symbol of power as well as wealth of knowledge. These libraries also exude a great deal of architectural grandeur. To some, the libraries are reservoirs of cultural and artistic treasures. For those who include visiting the local libraries an integral part of their travel itineraries, here is a list of the 20 grandest libraries in the world that are also tagged as UNESCO World Heritage sites. Make sure you include these sites in your next travel itineraries and cherish the world of knowledge.