Harvard, Massachusetts has its own mystery spot, specifically a "gravity hill" where it seems your car will roll uphill:
In plain English: A gravity hill is an optical illusion that gives the impression that your stationary car (when set in neutral) can defy gravity as if being pulled uphill by an unseen force. In fact, this topographical slight of hand is the outcome of the lay of the terrain, the position of trees, and a slight obstruction in the horizon. Presumably, any spirits that do appear are the ones consumed by those ready to test the hills powers.
One source suggests starting at "on a flat level at 38 Stow Road, next to the mailbox. At that point and looking ahead, one can see the incline, at the second curve in the road. Engaging the hills powers are as easy as following the directions at the car wash: stop the car, put in neutral, take foot off brake, roll up the hill."