The X Marks, Peabody

Imagine $20,000 buried in 20 holes throughout the Boston area. Not even deep holes, either. Imagine the cash just a foot below the surface, waiting to be dug up. It sounds like a spin on the movie Rat Race, but the cash is real and really out there at sites on public property marked with orange Xs. The money's original owner, Patrick Tarmey, loves competitions more than his money, so now he's hosting the ultimate scavenger hunt: find his cash first, and it's yours.

In another act of generosity, Patrick helps participants on their quests. Every few days, he releases a new clue about the cash's location online, including the cryptic "Stop digging up my house's foundation, please." On September 30, he'll go even further, releasing the exact coordinates of all the remaining stockpiles to anyone with a premium pass. The X Marks scavenger hunt is in partnership with David Arquette.