Was the moon covered by cities? Made out of cheese? Or once a beautiful Mayan woman?
Humanity's curiosity has led to obsessive scientific study of our lunar companion, to the point that we've landed spaceships on it. While it's hard for the moon to maintain much mystique after Alan Shepard hit a golf ball off its face with a 6-iron, there's still a bounty of secrets to go round.
So, what are you waiting for? Dive into 10 of our favorite lunar puzzlers.
Article originally published in 2009 on Discovery Space.