Stephen Wiltshire was diagnosed with autism at age three, and he was mute until age five. His drawings, which began as a way to calm him down from tantrums, have made him into a critically-acclaimed artist. They now sell for thousands of dollars a piece.

London-born Wiltshire, 35, recently came to New York City as both a tourist and an artist. After only a few minutes in a helicopter ride, he drew a 20-foot panorama of the city completely from memory. "I see the buildings and the skyline and see it from a bird's eye view," he told Reuters UK. "The whole of Manhattan."