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  1. Suspension bridge across a bay Golden Gate Bridge San Francisco Bay San Francisco California
  2. Giant mobile crane
  3. Biotechnology, Conceptual Illustration
  4. Albania, Shkodra, Landscape around the village with bridge over Drinit river
  5. Suspension bridge with a city in the background Brooklyn Bridge Manhattan New York City New York State
  6. Elisha Graves Otis shows his first elevator in the Crystal Palace, New York City, 1853
  7. California, Sonoma Valley, bridge
  8. Bridge across a river, Mississippi River, Natchez, Mississippi
  9. Alaska, Trans-Alaska Pipeline transports oil from Prudhoe Bay to Valdez, Alaska
  10. Open drawbridge across a river, Chicago River, Chicago, Cook County, Illinois
  11. Over London By Rail From 'London, A Pilgrimage', Written By William Blanchard Jerrold
  12. Belgium, Brussels, Atomium, Futuristic building
  13. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  14. Aqueduct across a river, Pont Du Gard, Nimes, Gard, Languedoc Rousillon, France
  15. Printed circuit board
  16. Bridge over a bay, Golden Gate Bridge, San Francisco, California
  17. Steelworker atop the Empire State Building, New York City, during its construction, 1931
  18. Hine: Steelworker, 1931, atop the Empire State Building
  19. Florida, Kennedy Space Center, launch
  20. Canada, Montreal: Library And National Archives Of Quebec
  21. Aerial Panorama Of Deception Pass Bridge In Washington State
  22. Vintage Parchment Biwing Seaplane Patent Print
  23. Golden Gate Bridge San Francisco CA
  24. Silhouette of a bridge over a river, Crescent City Connection Bridge, Mississippi River, Natchez, Mississippi
  25. Suspension bridge across the bay, Golden Gate Bridge, San Francisco Bay
  26. Tower Bridge, London, England,
  27. Suspension bridge covered with fog viewed from Hawk Hill Golden Gate Bridge San Francisco Bay San Francisco California
  28. Close Up View of Steam Locomotive Wheels
  29. Silhouette of a suspension bridge at dusk, Golden Gate Bridge, San Francisco, California,
  30. Suspension bridge lit up at dusk Golden Gate Bridge San Francisco Bay San Francisco California
  31. Barge passing under a bridge, Golden Gate Bridge, San Francisco, California
  32. Suspension bridge at sunrise, Golden Gate Bridge, San Francisco Bay, San Francisco, California,
  33. The engines on a C-17 Globemaster of the US Air Force
  34. Airplanes in a hangar, Mirabel Airport, Montreal, Quebec, Canada
  35. Expansion Arch St Louis MO
  36. Silhouette of a suspension bridge at sunset Mackinac Bridge Michigan
  37. Suspension bridge across a bay, Golden Gate Bridge, San Francisco, California
  38. Golden Gate Bridge San Francisco CA
  39. Biotechnology, Conceptual Illustration
  40. Bridge across the river, Verrazano Narrows Bridge, New York Harbor, New York City, New York State,
  41. SBD Dauntless Dive Bomber Of World War II
  42. Container ship passing under a suspension bridge Golden Gate Bridge San Francisco Bay San Francisco California
  43. Bridge Miami FL
  44. Suspension bridge across a bay Golden Gate Bridge San Francisco Bay San Francisco California
  45. Generator and Fan Belt in a Car Engine
  46. Chicago's Union Station
  47. Evening St Louis MO
  48. Suspension bridge across a bay, Golden Gate Bridge, San Francisco Bay, San Francisco, California,