FEI is a software and hardware company specializing in industrial electron microscopy, and they have a gallery of images that is second to none. Very interesting and jaw dropping work. I have used both TEM (transmission) and SEM (Scanning Electron Microscope) and I can tell you it is an incredibly tedious and very hit and miss type of work. It takes a lot of patience and dexterity to get it right but when you do, oh man, is it worth it!
FEI Electron Microscope Gallery