One of our teachers in my school was wanting some good material to teach a lesson on the Panama Canal.  I set off looking for materials and enjoyed the journey!  The Panama Canal is fascinating to me.  Here are some of the resources that I found (that weren’t blocked at my school - ex. YouTube and Google Videos are blocked).

The picture on front changes.  Also, there are lots of interesting stuff under “Multimedia” at the top

 
 
 
This video works but I don’t believe that you can make it full screen -  http://www.encyclomedia.com/video-panama_canal_building.html  (a November 2009 report)
 
You might find some good ideas among the lesson plan though.  - http://calonline.cusd.com/ushistoryS1/module03/03lessons/0303.htm
 
No video but great info from the Smithsonian Institute - http://www.sil.si.edu/Exhibitions/Make-the-Dirt-Fly/whybuild.html   
 
Photos - http://www.canalmuseum.com/canalphotos/index.htm

Have fun on your journey!