Below is an image of a scanning electron microscope image of the head of a human flea taken by retired scientific photographer, Steve Gschmeisser.
http://www.telegraph.co.uk/science/picture-galleries/7397841/Creepy-crawlies-Amazing-Scanning-Electron-Microscope-pictures-of-insects-and-spiders.html
Here is a transmission electron microscope image of a human liver cell taken by Dennis Kunkel. He even offers electron microscope calendars...how cool is that.
I will keep track of the favorites. Whoever posts the image first gets credit for finding the image. Good luck.
As Willie Nelson said, "the early bird gets the worm, but the second mouse gets the cheese."