11 Caterpillar.

This bizarre-looking tentacle monster is a caterpillar seen under a microscope, magnified 30 times. (source)

12 Human tongue.

The tongue’s surface is covered with thousands of taste buds and bumps called papillae which give it its rough texture. This is a (disturbing) magnified photograph of that description, taken by a scanning electron microscope. The papillae appear flaky because they constantly shed their top layer of skin. (source)

13 Blood cells in an artery.

So blood inside an artery looks like a bag of delicious candy? Yet another image was taken by a scanning electron microscope (seriously, where can we get one of these?): blood cells in a ruptured artery.

14 Sand grains.

This incredible picture taken by biomedical researcher Dr. Gary Greenberg is of sand grains magnified up to 300 times. Dr. Greenberg photographs the natural world with his self-invented high-definition 3D microscope. Prior to obtaining his Ph.D., he worked as a filmmaker and photographer. This is what you build your sandcastles with. (source)

15 Human eye.

A fascinating ultra close-up of the human eye, taken by Armenian scientist Suren Manvelyan for his microscopic ocular portrait series. (source)