To dream the impossible dream has been the great engine of progress in the world.  From the early explorers, to scientists and engineers, to man's quest to explore the planets.  The story of exploration is the story of mankind.  
When John Kennedy laid down the predicate of reaching the moon by the end of a decade, he defined for the whole county that kind of clear goal that also drives individuals forward.  
The story of some of these individuals, along with his own quest,  is what Chris Guillebeau writes about in The Happiness of Pursuit: Finding the Quest That Will Bring Purpose to Your Life.
My conversation with Chris Guillebeau:

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