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  1. John Ernst Worrell Keely
  2. Leeds Castle, Kent, England, United Kingdom, Europe
  3. The Renaissance
  4. Marie Curie
  5. Illustration of strip of land known as the 'fertile crescent'
  6. Charles Haddon Spurgeon (1834-92) engraved by D.J. Pound from a photograph
  7. Highland Light At Night
  8. Mount Vernon Mansion
  9. Civil War, Atlanta, c1863
  10. American Soldiers Practicing Shooting During Spanish-American War
  11. Alvin Ailey (1931-1989)
  12. Distillation apparatus, 19th century
  13. Rosserk Friary, County Mayo, Ireland
  14. Oath: Inspirational Quote and Motivational Poster
  15. Aurora borealis, 1872
  16. Title - Death Of Lincoln. Medium - Engraving Date- 1875
  17. Johann Gutenberg, German inventor
  18. Vicksburg Levee
  19. Detail of relief carving of the crocodile god, Kom Ombo, Egypt, Africa
  20. Home Of John D. Rockefeller, Forest Hill, Cleveland, Ohio
  21. Head and neck anatomy, historical artwork
  22. Ortelius's map of Austria, 1570
  23. Runic inscriptions
  24. Buttresses Under Foundation Of The Washington Monument
  25. Stonehenge at sunset
  26. George Washington hears his mother convince him not to go to sea as a midshipman
  27. Students At University Of Chicago Campus
  28. Hotel House Astor, New York
  29. Susan Brownell Anthony, c.1890-1906
  30. Mayan archaeological site, Tulum, Yucatan, Mexico
  31. Wooden Gate At Resort
  32. Officers of 4th New Jersey Infantry, American Civil War
  33. Aerial photo of Capitol Hill, May 1, 1932, with a view of the US Capitol and vicinity
  34. Free Huey Rally
  35. Fortifications in front of Atlanta, Georgia, during the American Civil War
  36. American History print of President George Washington and his family
  37. Pitch Lake, Trinidad
  38. Act I, 2015
  39. Painting of "The Bay of Algiers" by Paul Fenasse
  40. The Black Crook Company
  41. The Parthenon viewed from Propylaea, The Acropolis, Athens, Greece
  42. Margaret McGrath, former WASP sitting on the wing of in an XAT-6E trainer aircraft
  43. Railway signalman, 19th century
  44. Antique map of Asia Minor , present day Turkey and Cyprus
  45. Differential analyser, 1954
  46. Barack Obama (2008)
  47. Ortelius's map of Switzerland, 1570
  48. Antique map of Armenia