The World’s Columbian Exposition of 1893 is the sort of thing that just keeps spawning cool ideas. Not only did it spark the City Beautiful Movement — which heavily influenced the re-design of D.C.’s monumental core — it also saw the birth of Pabst Blue Ribbon, Wrigley’s Gum, and Cracker Jack’s. And, as we recently learned, the squished penny souvenir. Although we have spotted the machines around the country at a variety of tourist…