Endeavour's journey in photos

CAPE CANAVERAL, FL - MAY 16: In this handout provided by National Aeronautics and Space Administration (NASA), NASA space shuttle Endeavour lifts off from Launch Pad 39A at NASA's Kennedy Space Center May 16, 2011 in Cape Canaveral, Florida . After 20 years, 25 missions and more than 115 million miles in space, NASA space shuttle Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 18: In this handout provided by National Aeronautics and Space Administration (NASA), NASA space shuttle Endeavour begins the nine-minute Rendezvous Pitch Maneuver, or 'backflip,' in order to be photographed then dock on its last visit to the International Space Station on May 18, 2011 in space. After 20 years, 25 missions and more than 115 million miles in space, Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, Gabrielle Giffords's husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 18: In this handout provided by National Aeronautics and Space Administration (NASA), STS-134 and Expedition 27 crew members are pictured in the Harmony node of the International Space Station shortly after space shuttle Endeavour and the space station docked in space and the hatches were opened, from the left are European Space Agency astronaut Roberto Vittori, STS-134 mission specialist; NASA astronaut Mark Kelly, STS-134 commander; Russian cosmonaut Dmitry Kondratyev, Expedition 27 commander; NASA astronaut Cady Coleman, Expedition 27 flight engineer; and NASA astronaut Greg H. Johnson, STS-134 pilot May 18, 2011 in space. After 20 years, 25 missions and more than 115 million miles in space, NASA space shuttle Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 21: In this handout provided by National Aeronautics and Space Administration (NASA), the newly-installed Alpha Magnetic Spectrometer-2 is visible at center of the International Space Station's starboard truss as NASA space shuttle Endeavour makes its last visit to the International Space Station on May 21, 2011 in space. After 20 years, 25 missions and more than 115 million miles in space, Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 22: In this handout provided by National Aeronautics and Space Administration (NASA), Astronaut Andrew Feustel reenters the space station after completing n 8-hour, 7-minute spacewalk at 10:12 a.m. EDT as NASA space shuttle Endeavour makes its last visit to the International Space Station on May 22, 2011 in space. After 20 years, 25 missions and more than 115 million miles in space, Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 26: In this handout provided by National Aeronautics and Space Administration (NASA), NASA astronaut Greg Chamitoff during the mission's fourth STS-134 spacewalk outside the International Space Station (ISS) May 26, 2011 in space. During the spacewalk, Chamitoff and fellow astronaut Michael Fincke stowed the 50-foot-long boom and added a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, which extends the reach of the space station's robotic arm. The docked space shuttle Endeavour is visible at top right. After 20 years, 25 missions and more than 115 million miles in space, NASA space shuttle Endeavour is on its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, will lead mission STS-134 as it delivers the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)

IN SPACE - MAY 29: In this handout provided by National Aeronautics and Space Administration (NASA), back dropped by planet Earth the International Space Station (ISS) is seen from NASA space shuttle Endeavour after the station and shuttle began their post-undocking relative separation May 29, 2011 in space. After 20 years, 25 missions and more than 115 million miles in space, NASA space shuttle Endeavour is on the last leg of its final flight to the International Space Station before being retired and donated to the California Science Center in Los Angeles. Capt. Mark E. Kelly, U.S. Rep. Gabrielle Giffords' (D-AZ) husband, has lead mission STS-134 as it delivered the Express Logistics Carrier-3 (ELC-3) and the Alpha Magnetic Spectrometer (AMS-2) to the International Space Station. (Photo by NASA via Getty Images)