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Three stories of people who made their ambitious dreams a reality - Bilquis and Abdul Sattar Edhi started small, but went on to set up a comprehensive health care system across Pakistan; Thorsten Moewes is a German cleaner who braves the heights of some of the world's tallest monuments; and Bernie Krause has built up a vast archive of sounds of the natural world.

Photo: An Iranian child raises his hands at sunset at a beach in the Caspian Sea port city of Mahmoud Abad, in northern Mazandaran province, Iran.
Credit: Atta Kenare/AFP/Getty Images.