Steven Wiltshire was diagnosed as autistic at age 3 and was 5 years old before he started speaking but today at the age of 35 his art sells for thousands of dollars.
Most recently he has drawn a 20-ft panoramic view of the New York skyline after a ride over the city that lasted only minutes. Drawn completely from memory every building and street is correct and drawn completely to scale. The New York panorama follows those done in Tokyo, Rome, Hong Kong, Frankfurt, Madrid, Dubai, Jerusalem and London. Stephen Wiltshire was awarded a Member of the Order of the British Empire in 2006 for services to art. In September 2006 Stephen opened his permanent gallery in the Royal Opera Arcade, Pall Mall, London.
You can read more about Stephen and his art here.
a flash of delight 
Wow his work is amazing!
this is unbelievable.