This stunning image of a crowded, multi-layered library is not the work of M.C. Escher. It's actually the National Library of China in Beijing, as featured in Travel 365. The library looks big because it is big: the fifth largest in the world, in fact, with over 24 million items in 1.8 million square feet. [National Geographic Travel]

Image by Tian-yu Xiong, National Geographic Your Shot