This site allows you to scroll to the left to get smaller and smaller, so you can see subparticles. To the right you get bigger and bigger and see planets, then constellations, then galaxies, etc. It is like an extreme in and out zoom.
http://www.stumbleupon.com/su/1k0CXS/:MCJrbw.m:WHsT7hy5/htwins.net/scale2/
Michael Bradley - Time Traveler 