Every year, Nikon's Small World competition puts a call out to photomicrographers, asking for their best ultra-magnified images. The following photos were all captured using microscopes. The subjects are incredibly small, the capture process is extremely complex and the results are nothing short of incredible. These 20 are the best, as picked by a panel of expert judges. Nikon has left the public vote portion of the contest open, so you can still go and check out some of the other entries.