JAMES HUNT, MENTAL FLOSS:
"The British Library is the largest library collection in the world, with more than 170 million items in its catalogue. In fact, only 14 million of these are books. The library also keeps hold of manuscripts, journals, newspapers, magazines, sound and video recordings, maps, stamps, prints and drawings. And in an effort to make some of its collection more accessible, it has also placed over million license-free illustrations on the web which you can easily browse on Flickr."
Read more, here.