Sever and Sharon Peterson first heard of mazes from a British exchange student in 1971. Sixteen years later, this Minnesota couple opened their first corn maze on Sever's Farm. Each year, the Petersons have a different theme for their maze, from Wild West to Egyptian. Fittingly, in 2009, the couple went with a White House theme, with 26 signs containing fun facts placed throughout the maze. There are also six pictures of Sever along the way that when logged, help you pinpoint your bearings. At the end of the maze, if you can fill in those spots on a map, you're entered into a drawing to win their weekly gas card giveaway. And for another twist, congressmen, senators and the president himself can get in for free.