Florida State University has put up a very interesting Java applet on its website.

It begins as a view of the Milky Way Galaxy from a distance of 10 million light years and then zooms in towards Earth in powers of ten of distance -10 million, to one million, to 100,000 light years, etc.,until it finally reaches a large oak tree leaf.

But that is not all. It zooms into the leaf until it reaches to the level of the quarks viewed at 100 attometers. Whew! You really don’t have to understand all this to be awed by what you see, so go ahead! Fun times, try it out.
http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html