It's no secret that traveling is a great time for sketching...I count myself among the many that find an influx of new visual information, leads to to some productive doodling. Out of the ordinary architecture, fashion, signage, people and food, are all great fuel for creativity. Airports are an especially great place to get some sketching done, with time to kill, and a lot of people immobile for hours at a time. Here are some pages from Havana, New York and San Francisco.