I recall an animation/interactive thingy where you could go from the whole universe down to quarks by changin the order of magnitude step by step. Along the way you could see how big a galaxy is compared to the solar system, the solar system compared to the planets, the earth compared to big ben, and so on and so forth.
My google-fu is failing me, so I’m hoping someone remembers the same animation and actually has a link. Or more powerful google-fu.
Here’s one
Google “The Powers of Ten” for others.
Nikon’s Universcale?
DAMNIT!! I’ve been waiting for that page to load for like 5 minutes so I could post this. Stupid work internet!
Universcale! That’s the one. Thanks people. 
Dammit Beavis, that is the coolest thing I have ever seen.
http://4d2u.nao.ac.jp/english/4d2unav.html
[sub]woo! post #2000! No, please, everyone… keep your seats.[/sub]
Also, an IMAX movie based on the same idea:
It’s kinda short on science, but fairly entertaining.