The only diary known [bbc.com] to be written by President John F. Kennedy is up for auction on April 26th:
A diary kept by President John F Kennedy as a young man travelling in Europe, revealing his fascination with Adolf Hitler, is up for auction. Kennedy, then 28, predicted "Hitler will emerge from the hatred that surrounds him now as one of the most significant figures who ever lived". "He had in him the stuff of which legends are made," he continued.
Kennedy wrote the entry in the summer of 1945 after touring the German dictator's Bavarian mountain retreat. It is thought by historians to be the only diary [ever] kept by the 35th US president.
[...] He wrote that Hitler "had boundless ambition for his country which rendered him a menace to the peace of the world, but he had a mystery about him in the way he lived and in the manner of his death that will live and grow after him". The 61-page diary was kept by Kennedy around four months after Hitler committed suicide. [...] In a description of the auction, [Deirdre Henderson] wrote: "When JFK said that Hitler 'had in him the stuff of which legends are made', he was speaking to the mystery surrounding him, not the evil he demonstrated to the world."