This is a fascinating book by Ivan Amato cataloging extreme small scale images.
Particle collisions and trajectories in liquid hydrogen
Beamed electrons into Lanthanum Aluminate
Single cell of the plankton algea Calcidiscus Quadriperforatus
Microanatomy of the skin of a zebrafish
Ragweed Pollen scanned with an electron micrograph
Endothelial cell from the lining of a cows pulmonary artery, illuminated using molecular labels which glow under a fluorescence microscope
Microscopic blood vessel in the eye’s choroid layer, which nourishes the retina