Photomicroscopy requires significant focus stacking due to the very small depth of field. Two programs I use are Helicon Focus, and Helicon Remote.
Rhenium is one of the rarest elements in the earths crust, and has one of the highest boiling points at an estimated 5873K. Ever wonder what it looks like under the microscope?
Polarized light microscopy brings out incredible colors in chemicals. Have a look at Bromine under the microscope.
Holmium (a metal) looks fairly interesting by polarized light microscopy.
Take a peek at Aspirin under the microscope, fairly incredible!