A lot of artists out there suffer from mental disabilities, yet they produce some of the most stunning artwork that you can imagine. Take, for example, Stephen Wiltshire , who is famous for his incredibly detailed pen and ink drawings. Diagnosed with autism at the age of three, the gifted artist from London has a remarkable ability to render a city from memory after seeing it only once. He memorizes buildings, streets, and other cityscapes, and will do so with London, Tokyo or New York after a 20-minute helicopter ride.