People have been collecting stuff forever. When adults visit national parks, they can collect passport stamps or pamphlets. Children earn Junior Ranger badges, though getting one takes a lot more effort and time than a passport stamp. But there’s something else out there to collect, too, and it looks a lot like baseball trading cards
Harry S Truman National Historic Site
The Harry S. Truman National Historic Site must be one of the most entertaining historic places in the National Park System. It shows Harry and Bess' life before and after his presidency.