In 1919 there were just 6.7 million cars in America. There was no interstate system. The national park system was thirty-seven years young. In this fledgling environment for long-distance travel, H. A. Spallholz and family set out from Salem, New York, to see America's national parks. In his 1917 Haynes Roadster, Henry packed his family and a camera and headed west. From storied New England through Great Plains grasslands, up the Rocky Mountains...