The Great American History Puzzle
Another thing the Smithsonian magazine had in it was a puzzle contest. I didn't mention it, because I figgered you'd have to have the physical magazine in your hands to do it. But they have kindly made a digital copy of the issue available on the puzzle page, though you will have to part with personal details to get it for free. If nothing else, you get to read a great issue of a great magazine. Or you can join me in the long gauntlet of 10 puzzles leading to a final puzzle; first to solve it wins a grand prize of a trip to DC for four people with a behind-the-scenes "Secrets of the Smithsonian" tour.