Well, a part of Stonehenge is missing, and what it got used for is no less ridiculous.
Debate has raged for centuries over what exactly Stonehenge was, with theories ranging from a religious temple to a bitchin' magic trick by Merlin and some giants.
We know what we're putting our money on.
Either way, archaeologists think it was erected between 3000 and 2500 BCE, making it one of the oldest man-made structures still in existence. It's definitely one of the most famous.
What most people don't realize is that the most important part of Stonehenge appears to be missing. Drawings of the site from just a few centuries ago show a stone altar (which by the way would confirm it was originally a temple) but it's sure not there now. Experts have been obsessed with finding it, as it may very well be the most important rock in the formation and would finally solve the mystery of the 'henge.