The space shuttle Discovery flew over Washington DC on the back of NASA's Shuttle Carrier Aircraft before making its final landing at Dulles Airport. The shuttle will be housed at the Smithsonian National Air and Space Museum's Udvar-Hazy Center in Chantilly, VA. During it's operational lifetime, Discovery flew 39 missions into space, more than any other vehicle in the fleet. Photos of Discovery, including some taken by spectators during the DC flyby can be viewed on NASA's Space Shuttle Discovery page. Kind of cool. RIP Discovery.