The space shuttle Endeavour soars over the Golden Gate Bridge atop its 747 carrier during the final portion of its retirement tour on Sept. 21, 2012. Endeavour flew 25 missions, traveling more than 122,000 miles and accumulating 299 days in space. The Endeavour will be installed at the California Science Center in Los Angeles to inspire the next generation of explorers and engineers. Photo: Carla Thomas / NASA
