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.