Got ma(i)ze? What do you do for fun and profit if you've got acres and acres of corn? Why, you build a giant maze of course! Conceptis Puzzles has a neat article listing 21 of such corn mazes as captured by Google Earth. For example:
A Corn Corn Maze
Located in Nebraska, this maze was cut of a corn field and features… corn! | Image date: November 2004 | Discovered by Cyclonic | Coordinates: 41.094844,-100.62242 | View this maze in Google maps