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  1. President Donald Trump
  2. Adobe village, Rio Grande
  3. Valley of Death and the Wheat Field Gettysburg Pa
  4. Lincoln to Washington
  5. Classiebawn Castle With Ben Bulben In The Distance, Mullaghmore, County Sligo, Ireland
  6. Winston Churchill
  7. Nelson Mandela
  8. Rugged Coastline with Classiebawn Castle, Mullaghmore, County Sligo, Ireland
  9. Porch of Xerxes, Persepolis, Iran, Middle East
  10. Cannons on Gettysburg Battlefield
  11. Highlights from History: Ireland's 'Great Rebellion'
  12. Classiebawn Castle With Ben Bulben In The Distance, Mullaghmore, County Sligo, Ireland
  13. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  14. The Great Wall, near Jing Hang Ling, Beijing, China, Asia
  15. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  16. Concrete Blocks At Jewish Holocaust Memorial; Berlin, Germany
  17. Classiebawn Castle With Ben Bulben In The Distance, Mullaghmore, County Sligo, Ireland
  18. Pyramids at Giza, Cairo, Egypt, Africa
  19. The old Customs House, Oxford, Talbot County, Tred Avon River, Maryland
  20. An Open Camp in the Adirondacks
  21. Old Leanach Cottage, Culloden battlefield, Highland region, Scotland, UK
  22. Statue of Abraham Lincoln
  23. Camel riders at Giza Pyramids, Giza, Cairo, Egypt, Africa
  24. 19th Century Painting Of An African American Soldier In The Civil War
  25. Government Building, Victoria, British Columbia, Canada
  26. World War I poster of a Navy patrol boat in the sea and a plane shining a spotlight
  27. Snow capped mountains of the Anti-Lebanon Range, The Bekaa Valley, Lebanon
  28. An early telephone
  29. Dublin, entrance gates to Marsh's Library, Ireland
  30. 14th century theological cosmography
  31. Presidential portrait of President George H.W. Bush
  32. Construction of the Pyramids
  33. Leeds Castle, Kent, England, United Kingdom, Europe
  34. The Battle Of Britain
  35. Abraham Lincoln