One of Nasa's retired space shuttles has made a dramatic flypast over the centre of the US capital on the way to its final resting place in a museum.Discovery flew over the monuments along the National Mall in Washington DC at about 10:00 EST (14:00 GMT).
Piggy-backing on a modified Boeing 747, Discovery was flying at an altitude of about 1,500ft (457m), Nasa said.
The shuttle programme ended in 2011. Discovery will be on show at the Air and Space Museum in Virginia.
After circling four times over the Washington Monument, and passing the National Mall over Capitol Hill, the shuttle landed at Dulles Airport, a few miles outside Washington DC.
From there it will be towed to the nearby Smithsonian Air and Space Museum, where it will be on permanent display.
- Discovery was Nasa's third operational shuttle, launched on 30 August 1984
- Carried Hubble Telescope into space in 1990
- Flew 39 missions - more than any other ship in Nasa's fleet
- Participated in both the "Return to Flight" missions, after the Challenger and Columbia disasters
- Named after boats that undertook historic voyages of exploration, such as the vessel that discovered Hawaii and searched for the Northwest Passage
During the flypast, onlookers lined the roofs of the capital's buildings and the route to the airport, wanting to catch a glimpse of the shuttle.Earlier, crowds of onlookers gathered along the Florida shoreline as dawn broke on Tuesday to see the shuttle take off from Kennedy Space Center.
Cheers broke out from the estimated 2,000-strong crowd as the aircraft left the runway, the Associated Press reported.
Dozens of former shuttle workers and Nasa veterans were reported to be among the onlookers.
Discovery then passed low over a packed beach and made one final turn back over the runway at the space complex before climbing towards a cruising altitude.
The aircraft's fuselage was illuminated by the early Florida sunshine for moments before it headed out of sight on its journey up the East Coast.
Fleet leader In Washington, would-be shuttle-watchers gathered on the National Mall, the two-mile-long public park running through the heart of the city, for a prime view of the mid-morning flyover.
The flypast was also expected to delight onlookers at a regular plane-spotting haunt, Gravelly Point Park, just outside the city limits in Virginia.
Discovery's final destination is an annex of the Smithsonian Institute's National Air and Space Museum, situated in Virginia, close to Dulles, the main international airport serving Washington DC.
It will replace Enterprise - the prototype shuttle - which is moving on to the Intrepid Sea, Air and Space Museum in New York City later this year.
Endeavour, the third shuttle heading to a museum this year, is destined for the California Science Center in Los Angeles.
Retired General Jack Dailey, the National Air & Space Museum director, told the Associated Press "we pledge to take care of her forever", adding the shuttle will show young visitors "what America is capable of".
Sorena Sorenson, a geology curator for the Smithsonian Institution, was among thousands watching.
"This to me is just so bittersweet," she said.
Discovery was the most-used of the shuttle fleet, flying 39 missions, and was designated the fleet leader.
The shuttle fleet was decommissioned and the programme wound up in 2011, after 30 years in action, when construction was completed on the International Space Station.
Retirement of Nasa's iconic shuttle fleet was ordered by the US government, in part due to the high cost of maintaining the ships.
The decision leaves the country with no means of putting astronauts in orbit.
Nasa astronauts will hitch rides on Russian Soyuz craft in the near future to get to the International Space Station.
Private US companies are hoping to pick up where the shuttles left off, beginning with space station cargo.
The first run, by Space Exploration Technologies Corp, is set to take place in a few weeks.