circa 1909: Irish explorer Sir Ernest Henry Shackleton and two members of his expedition team beside a Union Jack within 111 miles of the South Pole, a record feat. (Photo by Hulton Archive/Getty Images)
circa 1909: Irish explorer Sir Ernest Henry Shackleton and two members of his expedition team beside a Union Jack within 111 miles of the South Pole, a record feat. (Photo by Hulton Archive/Getty Images)