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  1. Pinnacle Tower and Shelby Pedestrian Bridge, Nashville, Tennessee, USA
  2. View Of The Sphinx At The Pyramids Of Giza On A Sunny Day, Giza, Cairo, Egypt, Africa
  3. Aerial view of buildings in a city, New York City, New York State
  4. The Construction Of The Manhattan Bridge During 1901-1909
  5. Great Wall of China Mutianyu China
  6. England, Wiltshire, Stonehenge
  7. Metalwork
  8. Low angle view of a bridge, Brooklyn Bridge, Manhattan, New York City, New York State
  9. A Soyuz TMA-M spacecraft soars over the Atlantic Ocean at sunset
  10. Tsing Ma Bridge At Sunset, Tsing Yi, Hong Kong, China
  11. Phobos mission rocket system ready for departure
  12. Sydney Harbour Bridge From Mcmahons Point At Sunrise, Sydney, New South Wales, Australia
  13. Brooklyn Bridge, New York City
  14. Bridge over a river, Golden Gate Bridge, San Francisco, California
  15. Supertree Grove and skywalk in the Gardens by the Bay, Marina South, Singapore
  16. Suspension bridge across the river, Talmadge Bridge, Savannah River, Savannah, Chatham County, Georgia,
  17. Starship inspired by the novels of Stephen Baxter
  18. Starship inspired by the novels of Stephen Baxter
  19. Suspension bridge lit up at dusk, Golden Gate Bridge, San Francisco Bay, San Francisco, California,
  20. Bridge over an inlet, The Burrard Street Bridge, False Creek, Granville Island, Vancouver, British Columbia, Canada
  21. Bay Bridge, San Francisco Bay, San Francisco, California
  22. Canada, New Brunswick: Confederation Bridge Along The Trans-Canada Highway
  23. CRS-11 Mission, Falcon 9 Liftoff, Kennedy Space Center, Florida
  24. The Inner Gates and Bridge, Ballysaggartmore Towers, Lismore, County Waterford, Ireland
  25. Frank Whittle's early development of the jet engine
  26. Drawing of flying machines
  27. A TBM-1C Avenger Torpedo Bomber Of World War II
  28. New Kaiser-Frazer Automobile
  29. Suspension bridge lit up at dusk, Golden Gate Bridge, San Francisco, California
  30. A CV-22 Osprey hangs in a anechoic chamber
  31. Space station from 2001: A Space Odyssey
  32. Sydney Harbour Bridge From Mcmahons Point At Sunrise, Sydney, New South Wales, Australia
  33. Car design
  34. Aerial view of the Seven Mile Bridge near Marathon Island in the Florida Keys
  35. Suspension bridge covered with fog viewed from Hawk Hill Golden Gate Bridge San Francisco Bay San Francisco California
  36. Architectural Abstract
  37. BulgariaSat-1 Mission Liftoff And Water Tower, Kennedy Space Center, Florida
  38. Suspension bridge covered with fog viewed from Hawk Hill Golden Gate Bridge San Francisco Bay San Francisco California
  39. Construction of the Panama Canal, Workers camp in the Highlands of the Emperor, 1886
  40. Aerial view of the Seven Mile Bridge near Marathon Island in the Florida Keys
  41. Germany, Berlin, Passing Train At Local Central Train Station
  42. Aerial View Of Lock and Dam # 4 Over Mississippi River, Alma, Wisconsin
  43. Aerial view of the Seven Mile Bridge near Marathon Island in the Florida Keys
  44. Greece, Peloponese Region, Gulf of Corinth, Patra-area, Rio Antirio Bridge
  45. Sailboat near a bridge, Golden Gate Bridge, San Francisco, California
  46. The Golden Gate Bridge in the early morning fog. San Francisco
  47. Inside the locomotive repair shops at an Illinois Central Railroad yard in Chicago.
  48. Space Station 5 in Earth orbit