Can You Solve The 3-Mile Walk Riddle?

News: The Curiosity Podcast is here! Subscribe on iTunes, Stitcher, Google Play Music, SoundCloud and RSS.

Here is the 3-mile riddle; can you solve it? You walk one mile due south, then you walk one mile due west, and finally you walk one mile due north. You end up exactly where you started. Where are you? For this puzzle, you must assume the Earth is a perfect sphere. There is one pretty obvious answer this this puzzle, but-think a little harder-there are more answers than just this one. Can you solve it?