Some guy made a backyard coaster that goes through his whole back yard! Pretty impressive for a backyard coaster!
Here is the link to the POV...
http://www.youtube.com/watch?v=7sFZg9Aa ... re=related
And here is the link to what the car looks like...
http://www.youtube.com/watch?v=G5wErKAs ... ideo_title
This looks like a boatload of fun...
http://www.youtube.com/watch?v=lrHrKInm ... re=related
Check it out!