Bridge from just basic bricks? I teach an after-school engineering class using LEGO bricks, one of our classes has the students build a bridge.  Each student gets a custom set of about 150 2x4 bricks, about 300 2x2 bricks, and, if I'm feeling generous, about 15 2x8 plates.  Although I've seen many fancy bridges made with technic parts, I've never seen an awesome bridge made with just basic bricks.  I'm looking for a reference bridge to show the kids, after the build their own, what is possible.  So, show me the best bridge (either a link to someone else's bridge , or a photo of your own) that can be made with just basic bricks!

Scope note: Most people don't have this custom set of bricks, so links or pictures of any bridge that uses almost no rare parts and use almost no technics would be cool.

Background: 

LEGO Bridge Page: http://lego.sparre-andersen.dk//Transport/Broer/

Arch from archive
  

Cantilever from archive


Big:  from archive


Sort of basic arch: from flickr
If you also want them to be aware of the solidity of their bridge, you may want to have a look at this contest.

Note that bridges made of stacked plates are much more solid than Technic ones.