Space Shuttle Enterprise (NASA Orbiter Vehicle Designation: OV-101) was the first Space Shuttle orbiter. It was built for NASA as part of the Space Shuttle program to perform test flights in the atmosphere.[2] It was constructed without engines or a functional heat shield, and was therefore not capable of spaceflight. Enterprise was stored at the Smithsonian's hangar at Washington Dulles International Airport before it was restored and moved to the newly built Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center at Dulles International Airport, where it was the centerpiece of the space collection. On April 12, 2011, NASA announced that Space Shuttle Discovery, the most traveled orbiter in the fleet, would be added to the collection once the Shuttle fleet was retired. On April 17, 2012, Discovery was transported by Shuttle Carrier Aircraft to Dulles from Kennedy Space Center, where it made several passes over the Washington D.C. metro area. Courtesy: Wikipedia.org