Note: No screencap is really gonna do the guide justice, you're gonna have to play with it yourself (or watch the video) to put things in perspective. A perspective your feeble mind won't comprehend!
This is a link to an interactive guide to the size of the known universe (just like the title says -- f***ing crazy!). It starts in the middle at the size of man (or a large lady), but you can use the slider bar to move left to smaller objects (down to ants, atoms, quarks, etc.) and right to larger ones (planets, galaxies, yo momma, etc.). Clicking objects will open a pop-up with more info. Now follow the link and get clicking!.