This image has been making the rounds. A teeny tiny Sydney Opera House. Just sixty four microns long. I know it's not practical, or even decorative.

What it is, is very cool.

For the metrically challenged, a millimeter is roughly one 25th of an inch.
A micron (or micrometer) is one 1000th of a millimeter.

The tiny Aussie wonder can take its place next to the Cornell Nano Guitars, mark one and mark two.

If you still haven't gotten your fill of electron microscopy for the day (really, does anyone?) check these out.