FEI, a company that manufactures microscopes, regularly holds a macro photo contest in which entrants must submit pictures of things that cannot be seen without magnification. Here is a selection of a few of the entries into the competition for 2012.
Porous structure of ground coffee
The texture of the spider skin
The human intestine containing hundreds of differend kinds of bacteria
Curved silica crystals
Tungsten filament of a household incandescent lamp
Hepatitis B virus core with 3D reconstruction overlay
Silver clusters deposited by thermal evaporation onto self-assembled polystyrene nano-spheres (900 nm).
Moss, a host for methane eating bacteria
Aphid on a leaf
Mouse kidney fractured
Cracked grain of corn showing the starch within the cells
Aedes aegypti mosquito egg
A live aphid Chaitophorus sp. on populus alba leaf
Geranium dissectum pollination