Check out this article about Bob Burnquist's Mega ramp he built at his house in California. It is not the first Mega ramp but it is the first permanent Mega ramp. Read some of the stuff he does with a skateboard; it's crazy. Good read if you grew up skateboarding like me or just have an interest in extreme sports.
http://www.nytimes.com/2006/11/01/sports/othersports/01ramp.html?ex=1163048400&en=3dfbd66f38176809&ei=5 070&emc=eta1