The X-30 National Aero-Space Plane (NASP) was an attempt by the United States to create a viable single stage to orbit (SSTO) spacecraft. The project was cancelled prior to the first craft being built.
A large, detailed scale mock up of the X-30 was built by engineering students at Mississippi State University's Raspet Flight Research Lab in Starkville, Mississippi. The mock up is currently on display at the U.S. Space Camp program facility in Huntsville, Alabama.
Space
Links: en.wikipedia.org
By: kjfitz
http://en.wikipedia.org/wiki/X-43A
http://www.ae.msstate.edu/rfrl/pages/x30.html